There are nights when you want something warm, cheesy, filling, and comforting—but you also want dinner to include plenty of protein and vegetables. Cheesy Chicken, Tomato & Broccoli Casserole brings those goals together in one delicious baking dish.
Tender pieces of seasoned chicken are combined with fresh broccoli, juicy tomatoes, onions, garlic, and a creamy Greek yogurt-based sauce before everything is topped with mozzarella, sharp cheddar, and Parmesan cheese. Once baked, the vegetables become tender, the chicken stays juicy, and the cheese melts into a golden, bubbly topping.
The result is a casserole that feels like classic comfort food while still putting lean protein and vegetables at the center of the meal.
It’s also wonderfully practical. You can prepare most of the ingredients ahead of time, customize the vegetables based on what you have available, and save the leftovers for easy lunches or dinners.
Whether you’re trying to add more vegetables to your meals, increase your protein intake, prepare healthier dinners for your family, or simply find another easy chicken recipe, this casserole deserves a place in your regular dinner rotation.
Why You’ll Love Cheesy Chicken, Tomato & Broccoli Casserole
A good weeknight recipe needs to accomplish several things. It should taste great, use ingredients that aren’t difficult to find, provide enough food to satisfy everyone, and preferably leave you with fewer dishes to wash.
This casserole checks all of those boxes.
You get tender chicken, colorful vegetables, a creamy sauce, and melted cheese in nearly every bite.
It’s Packed With Protein
Chicken breast is the primary protein source, while Greek yogurt and cheese contribute additional protein.
A protein-rich meal can be especially satisfying and can help keep you feeling full longer than a meal built primarily around refined carbohydrates.
Vegetables Are a Major Part of the Meal
Broccoli and tomatoes aren’t simply garnishes.
With several cups of vegetables incorporated directly into the casserole, they become an important part of every serving.
It’s Comforting Without Being Excessively Heavy
Traditional casseroles sometimes rely heavily on cream, butter, condensed soups, and large quantities of cheese.
This version uses plain Greek yogurt and chicken broth to create creaminess while still including enough cheese to give you that classic casserole experience.
It’s Easy to Customize
Don’t have broccoli?
Use cauliflower.
Have spinach that needs to be used?
Add it.
Want more vegetables?
Add mushrooms, peppers, zucchini, or asparagus.
Once you understand the basic recipe, you can create countless variations.
It’s Great for Leftovers
A casserole that tastes good the next day is always useful.
Prepare one large dish and you can potentially cover dinner plus several lunches.
Ingredients
Serves approximately 6
For the Chicken and Vegetables
- 1½ pounds boneless, skinless chicken breasts
- 4 cups fresh broccoli florets
- 2 cups cherry or grape tomatoes, halved
- 1 small yellow onion, diced
- 3 cloves garlic, minced
- 1 tablespoon olive oil
Seasonings
- 1 teaspoon Italian seasoning
- 1 teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon smoked paprika
- ½ teaspoon salt
- ¼ teaspoon freshly ground black pepper
For the Creamy Cheese Sauce
- 1 cup plain Greek yogurt
- ½ cup low-sodium chicken broth
- 1 cup shredded reduced-fat mozzarella cheese
- ½ cup shredded sharp cheddar cheese
For the Topping
- ½ cup shredded mozzarella cheese
- ¼ cup grated Parmesan cheese
- Fresh parsley or basil for garnish, optional
How to Make Cheesy Chicken, Tomato & Broccoli Casserole
Step 1: Preheat Your Oven
Preheat your oven to 375°F.
Lightly coat a 9-by-13-inch baking dish with cooking spray or brush the inside with a small amount of olive oil.
Preparing the dish beforehand makes serving and cleanup much easier.
Step 2: Prepare the Chicken
Cut the chicken breasts into approximately 1-inch pieces.
Keeping the pieces relatively uniform helps them cook at approximately the same rate.
Place the chicken in a large mixing bowl.
Add:
- Italian seasoning
- Garlic powder
- Onion powder
- Smoked paprika
- Salt
- Black pepper
Toss until every piece is evenly coated.
You can season the chicken several hours ahead of time and keep it covered in the refrigerator if you want to get some of the preparation finished earlier in the day.
Step 3: Brown the Chicken
Heat the olive oil in a large skillet over medium-high heat.
Add the seasoned chicken.
Cook for approximately 4–5 minutes, stirring occasionally so several sides of the chicken develop a little color.
You’re not trying to cook the chicken completely.
The goal is simply to give it a head start and develop additional flavor. The chicken will finish cooking while the casserole is baking.
Transfer the chicken to your prepared casserole dish.
Step 4: Prepare the Broccoli
Bring a pot of water to a boil or prepare a steamer basket.
Add the broccoli and cook for approximately 2–3 minutes.
You want the broccoli to turn bright green and begin softening while remaining relatively firm.
Drain it thoroughly.
This step is important because broccoli can hold quite a bit of water. Too much excess moisture can make your finished casserole watery.
If necessary, allow the broccoli to sit in a colander for several minutes before adding it to the casserole.
Step 5: Prepare the Tomatoes
Wash the cherry or grape tomatoes and slice them in half.
Tomatoes add beautiful color and fresh flavor while releasing a small amount of juice as they cook.
If you’re using especially juicy tomatoes, you can gently pat the cut sides with a paper towel before adding them to the casserole.
Step 6: Make the Creamy Sauce
Add the Greek yogurt and chicken broth to a medium bowl.
Whisk until smooth.
Stir in:
- 1 cup mozzarella
- ½ cup sharp cheddar
Mix until everything is evenly combined.
The sauce may look fairly thick before baking. That’s perfectly fine.
As the casserole cooks, juices from the chicken, tomatoes, onions, and broccoli will combine with the yogurt mixture and cheese.
Step 7: Assemble the Casserole
Add the broccoli, tomatoes, diced onion, and minced garlic to the baking dish containing the chicken.
Gently toss everything together.
Pour the Greek yogurt and cheese mixture over the ingredients.
Carefully stir again until the chicken and vegetables are coated.
Spread everything into an even layer.
Step 8: Add the Cheese
Now comes the part that turns a healthy chicken and vegetable dinner into irresistible comfort food.
Sprinkle the remaining mozzarella evenly across the casserole.
Finish with the Parmesan.
You don’t necessarily need an extremely thick layer of cheese. A moderate amount spread evenly across the surface gives you plenty of cheesy flavor in every serving.
Step 9: Bake
Place the casserole into your preheated oven.
Bake uncovered for approximately 25–30 minutes.
The exact cooking time will depend on the size of your chicken pieces and your oven.
The chicken should reach an internal temperature of 165°F before serving.
The vegetables should be tender and the cheese should be completely melted and bubbling around the edges.
Step 10: Make the Cheese Golden
For an extra-appetizing finish, turn your oven to broil for approximately 1–2 minutes.
Watch the casserole continuously.
The difference between beautifully browned cheese and burned cheese can happen very quickly under a broiler.
Once you see golden spots developing across the surface, remove the casserole.
Step 11: Let It Rest
This might be the hardest step because your kitchen is going to smell incredible.
Let the casserole rest for approximately 5–10 minutes before serving.
Resting allows the sauce to settle and makes it easier to scoop portions from the baking dish.
Sprinkle chopped parsley or fresh basil over the top for a final burst of color.
Why Chicken and Broccoli Work So Well Together
Chicken and broccoli have become a classic combination for good reason.
Chicken has a relatively mild flavor, which means it works beautifully with garlic, herbs, spices, vegetables, sauces, and cheeses.
Broccoli brings a completely different texture.
While the chicken is tender and juicy, properly cooked broccoli retains a little bite. That contrast prevents the casserole from becoming too soft.
Broccoli also absorbs some of the flavors surrounding it.
Instead of eating plain steamed broccoli on the side, you’re enjoying broccoli coated with garlic, herbs, creamy sauce, tomato juices, and melted cheese.
Suddenly eating more vegetables doesn’t feel like much of a challenge.
Don’t Forget the Tomatoes
Broccoli may get most of the attention in this casserole, but the tomatoes play an important role.
As tomatoes bake, their flavor becomes sweeter and richer.
They also release juices that combine with the creamy sauce.
And visually, they make a huge difference.
A casserole containing green broccoli, bright red tomatoes, golden cheese, and fresh herbs simply looks more inviting than a casserole made entirely from beige ingredients.
We eat with our eyes first, and colorful vegetables can make healthier meals much more appealing.
Why Greek Yogurt Works in Casseroles
Greek yogurt is one of those ingredients worth keeping around because it can be used in far more than breakfast.
Plain Greek yogurt can provide creaminess in recipes that might otherwise rely heavily on mayonnaise, sour cream, or heavy cream.
It’s especially useful in casseroles.
The yogurt provides:
- Creamy texture
- Slight tanginess
- Additional protein
- A base for herbs and seasonings
- Moisture for chicken and vegetables
For this recipe, make sure you’re using plain, unsweetened Greek yogurt.
Vanilla yogurt definitely doesn’t belong in your chicken casserole!
Choosing the Right Cheese
This recipe combines three cheeses because each contributes something slightly different.
Mozzarella
Mozzarella provides that familiar stretchy, melted-cheese texture.
Its mild flavor also means it won’t overwhelm the chicken and vegetables.
Sharp Cheddar
Sharp cheddar provides stronger cheese flavor.
Because the flavor is more pronounced, you don’t necessarily need enormous quantities to notice it.
Parmesan
Parmesan brings salty, savory flavor and helps create a flavorful top layer.
Together, these cheeses make the casserole taste indulgent without requiring an excessively thick cheese layer.
Fresh Broccoli vs. Frozen Broccoli
Fresh broccoli works particularly well in this recipe because you can control the texture more easily.
However, frozen broccoli can work too.
If using frozen broccoli, thaw it completely and drain it extremely well before adding it to the casserole.
You may even want to gently press excess moisture from the broccoli using clean paper towels.
This helps prevent a watery casserole.
Frozen broccoli has already been partially cooked during processing, so you generally won’t need to blanch it before assembling the casserole.
Can You Use Rotisserie Chicken?
Absolutely.
Using cooked rotisserie chicken can make this recipe even faster.
Remove the skin and shred or chop approximately 3–4 cups of cooked chicken.
Because the chicken is already cooked, skip the skillet-browning step.
Add the chicken directly to the casserole and continue with the recipe.
You may also be able to slightly reduce the baking time since you’re primarily heating the ingredients and cooking the vegetables.
Just make sure the entire casserole is heated thoroughly before serving.
Add Even More Vegetables
Want to turn this into an even more vegetable-packed casserole?
There are plenty of options.
Mushrooms
Sauté sliced mushrooms before adding them to the casserole.
They contribute earthy, savory flavor.
Spinach
Add several handfuls of fresh spinach.
It will wilt dramatically during cooking, allowing you to add quite a bit without overwhelming the dish.
Bell Peppers
Red, yellow, or orange peppers add sweetness and additional color.
Zucchini
Chopped zucchini works well, but consider sautéing it briefly first because zucchini releases water during cooking.
Cauliflower
Replace some or all of the broccoli with cauliflower florets.
Asparagus
Chopped asparagus is particularly delicious during spring.
Kale
Finely chopped kale adds texture and another dark leafy vegetable to your dinner.
Want More Flavor? Try These Variations
Once you’ve made the original version, experiment with different seasonings.
Italian Chicken Casserole
Add additional oregano and basil and sprinkle fresh basil over the finished casserole.
You could also add a small amount of marinara sauce.
Spicy Chicken Casserole
Add crushed red pepper flakes, cayenne pepper, or diced jalapeño.
Pepper Jack cheese can replace some of the mozzarella.
Garlic Lover’s Version
Increase the fresh garlic and add roasted garlic to the sauce.
Mediterranean Version
Add spinach, olives, oregano, and a small amount of feta cheese.
Southwest Version
Replace the Italian seasoning with cumin, chili powder, smoked paprika, and oregano.
Add black beans, corn, peppers, and a little Pepper Jack cheese.
One basic casserole can become several completely different dinners.
Make It a Lower-Carbohydrate Dinner
This casserole is already relatively easy to incorporate into a lower-carbohydrate meal because the main ingredients are chicken, vegetables, yogurt, and cheese.
Serve it by itself or pair it with:
- Cauliflower rice
- Roasted cauliflower
- Green salad
- Roasted zucchini
- Sautéed spinach
- Green beans
This gives you a substantial dinner without needing pasta, rice, or bread.
Want Something More Filling?
If you’re feeding hungry family members or want the casserole to stretch further, add a healthy carbohydrate.
Good options include:
Brown Rice
Cook the rice separately and serve the casserole over it.
Quinoa
Quinoa works especially well because its mild flavor allows the casserole sauce to shine.
Whole-Wheat Pasta
Serve the chicken and vegetables over a small portion of pasta.
Baked Potato
Split open a baked potato and spoon the casserole over it.
Sweet Potato
The natural sweetness of roasted sweet potatoes provides an interesting contrast with the savory chicken and cheese.
Turn Leftovers Into a Completely Different Meal
Eating the exact same leftovers several days in a row can become boring.
Instead, repurpose them.
Chicken Casserole Wrap
Warm the leftovers and place them inside a whole-grain tortilla with spinach.
Stuffed Baked Potato
Bake a potato and fill it with reheated chicken casserole.
Chicken and Broccoli Bowl
Serve the leftovers over brown rice, quinoa, or cauliflower rice.
Chicken Pasta
Mix a smaller portion of the casserole with cooked whole-wheat pasta.
Chicken Salad Bowl
Reheat the chicken and vegetables and serve them over greens for a warm-and-cold dinner combination.
One casserole can potentially become several different meals.
Meal Prep Made Easier
Meal prep doesn’t necessarily mean spending an entire Sunday cooking seven completely different meals.
Sometimes it simply means making more food than you need for one dinner.
That’s where casseroles are especially helpful.
After dinner, divide the remaining casserole into individual airtight containers.
Now you’ve created grab-and-go lunches or easy dinners for later in the week.
Pair each serving with a different side to keep things interesting.
For example:
Monday: Casserole with salad
Tuesday: Casserole with brown rice
Wednesday: Casserole over a baked potato
Thursday: Casserole with roasted vegetables
The main dish stays the same while the overall meal changes.
Can You Prepare It Ahead of Time?
Yes.
You can prepare several components ahead of time.
Cut and season the chicken.
Chop the broccoli.
Dice the onion.
Slice the tomatoes.
Shred the cheese.
Mix the seasonings.
Store everything appropriately in the refrigerator until you’re ready to assemble and cook the casserole.
If assembling the entire casserole ahead of time, keep it covered and refrigerated, then bake it when needed. Because the dish will be cold, it may require additional baking time.
Always make sure the chicken reaches 165°F internally.
How to Prevent a Watery Casserole
Vegetable casseroles can sometimes become watery because vegetables naturally release moisture as they cook.
A few simple tricks can help.
Drain Your Broccoli
Whether you’re using fresh or frozen broccoli, remove as much excess moisture as possible.
Don’t Overload It With Tomatoes
Tomatoes release liquid as they bake. Stick relatively close to the recommended amount.
Don’t Add Too Much Broth
The chicken and vegetables will create additional moisture during cooking.
Let It Rest
The sauce will often appear thinner immediately after coming out of the oven.
Allowing the casserole to rest for several minutes can improve its consistency.
Don’t Overcook Your Chicken
Dry chicken can ruin an otherwise fantastic casserole.
Remember that the chicken cooks twice.
First, you’re browning it briefly in the skillet.
Then it goes into the oven.
That’s why you don’t want to fully cook the chicken during the first step.
A few minutes in the skillet creates color and flavor while leaving enough cooking to happen in the oven.
Using an instant-read thermometer is one of the easiest ways to know when chicken is ready.
Once the thickest pieces reach 165°F, you’re good to go.
How to Store Leftovers Safely
Allow leftovers to cool slightly, but don’t leave the casserole sitting at room temperature for an extended period.
Transfer leftovers to airtight containers and refrigerate them promptly.
For best quality, enjoy refrigerated leftovers within approximately 3–4 days.
When reheating, make sure the food is steaming hot throughout.
Individual servings can be reheated in the microwave.
Larger portions can be placed into an oven-safe dish, covered, and warmed in the oven.
Adding a tablespoon of chicken broth before reheating can help if the casserole seems dry.
A Smart Approach to Healthier Comfort Food
One of the most sustainable ways to improve your eating habits is to stop thinking that healthy meals and comfort food must exist in completely separate worlds.
You don’t necessarily need to eliminate cheese.
You don’t need to swear off casseroles.
And you certainly don’t have to survive on plain chicken and steamed broccoli.
Instead, think about the overall structure of the meal.
Start with a quality protein.
Add plenty of vegetables.
Use herbs, spices, garlic, and onions generously for flavor.
Choose a lighter creamy base when appropriate.
Then use ingredients like cheese strategically to make the meal satisfying.
That approach allows you to enjoy food rather than constantly feeling as though you’re following a restrictive diet.
Healthy Eating Is About What You Add, Too
People often approach healthier eating by asking:
“What should I stop eating?”
Sometimes a better question is:
“What nutritious ingredients can I add?”
Can you add another vegetable?
Can you include lean protein?
Can you swap some refined grains for whole grains?
Can you add beans?
Can you add herbs and spices instead of relying entirely on salt?
Can you add fruit to breakfast?
Small additions can gradually change the nutritional quality of your overall diet.
This casserole demonstrates that philosophy perfectly.
Instead of removing everything enjoyable about a cheesy casserole, we’re adding chicken, broccoli, tomatoes, onions, garlic, herbs, and Greek yogurt.
The result still tastes like comfort food.
Perfect for Busy Weeknights
After a long day, complicated recipes become much less appealing.
That’s why having several dependable chicken recipes can make healthy eating easier.
This casserole doesn’t require advanced cooking techniques.
Chop.
Season.
Brown.
Mix.
Bake.
That’s about it.
And while the casserole is baking, you have time to prepare a salad, clean the kitchen, pack tomorrow’s lunch, or simply sit down for a few minutes.
A Dinner the Whole Family Can Enjoy
One challenge with healthier recipes is finding meals that don’t feel like “diet food” to everyone else at the table.
Cheesy casseroles tend to solve that problem.
Kids may be more willing to try broccoli when it’s surrounded by chicken and melted cheese.
Adults get a comforting dinner.
And the cook gets the satisfaction of serving a meal containing plenty of protein and vegetables.
If someone isn’t a fan of broccoli, customize one section of the casserole with cauliflower, spinach, or another vegetable.
Healthy family meals don’t have to be complicated.
Suggested Side Dishes
Although this casserole can easily be served on its own, a simple side can round out dinner.
Try:
- Garden salad with vinaigrette
- Roasted asparagus
- Garlic green beans
- Roasted Brussels sprouts
- Brown rice
- Quinoa
- Cauliflower rice
- Whole-grain dinner roll
- Fresh fruit
- Cucumber and tomato salad
If your casserole already contains plenty of vegetables, keep the side simple.
Optional Crunchy Topping
If you love casseroles with a crispy top, combine:
- ¼ cup whole-grain breadcrumbs
- 1 tablespoon grated Parmesan
- ½ teaspoon Italian seasoning
Sprinkle the mixture lightly over the cheese before baking.
A small amount can provide plenty of crunch without creating an excessively thick breadcrumb layer.
Frequently Asked Questions
Can I use chicken thighs?
Yes.
Boneless, skinless chicken thighs can replace chicken breasts.
They’ll provide a richer flavor and tend to remain very juicy.
Cooking time may vary slightly, so rely on internal temperature rather than time alone.
Can I leave out the tomatoes?
Absolutely.
If tomatoes aren’t your favorite, leave them out and add another vegetable.
Red bell peppers are a good substitute if you still want some bright color.
Can I make this casserole spicy?
Yes.
Add crushed red pepper flakes, cayenne, diced jalapeños, or hot sauce.
You can also replace some of the mozzarella with Pepper Jack.
Can I add rice directly to the casserole?
You can, but the recipe would need additional liquid and adjusted cooking times if using uncooked rice.
For the easiest and most predictable results, prepare rice separately and serve the casserole over it.
Can I use leftover chicken?
Yes.
Cooked chicken makes this recipe even faster.
Add approximately 3–4 cups of chopped or shredded cooked chicken and reduce the baking time as needed.
What other cheese works?
Try Monterey Jack, provolone, Gouda, Swiss, or Pepper Jack.
Mixing two or three varieties can create excellent flavor.
Approximate Nutrition
Exact nutrition will depend on the specific brands and quantities you use, but a serving of this casserole can provide a substantial amount of protein along with vegetables.
Choosing reduced-fat cheese and plain Greek yogurt can help keep the overall dish lighter than many traditional cream-based casseroles.
If you’re tracking calories, protein, carbohydrates, sodium, or other nutrients for a specific dietary goal, calculate the nutrition using the exact ingredients and serving sizes you use at home.
Healthy Recipe of the Day Tip
Build healthier comfort food instead of eliminating comfort food.
Start with the meal you already enjoy and look for simple improvements.
Add vegetables.
Choose lean protein.
Reduce overly heavy sauces.
Use herbs and spices for flavor.
Control portions of calorie-dense ingredients.
Serve nutritious sides.
These small changes can transform everyday comfort-food favorites into meals that fit more easily into a balanced eating pattern.
Final Thoughts
Cheesy Chicken, Tomato & Broccoli Casserole proves that a healthy dinner can still be warm, creamy, cheesy, and satisfying.
You get tender seasoned chicken, colorful broccoli, juicy roasted tomatoes, aromatic garlic and onions, creamy Greek yogurt sauce, and three delicious cheeses all baked together in one comforting dish.
It’s easy enough for an ordinary weeknight but flavorful enough that you won’t feel like you’re settling for another boring healthy dinner.
Make it exactly as written the first time, and then start experimenting.
Add mushrooms.
Throw in spinach.
Make it spicy.
Serve it over quinoa.
Turn the leftovers into wraps.
Use rotisserie chicken when you’re short on time.
That’s what makes recipes like this so valuable: they aren’t just recipes—they’re flexible foundations you can adapt to your family’s tastes and your schedule.
So preheat the oven, grab your casserole dish, and get ready for a healthy dinner filled with plenty of vegetables, protein, and gloriously melted cheese.
Because sometimes the best way to eat your broccoli is underneath a bubbling layer of cheese.
What would you add to this Cheesy Chicken, Tomato & Broccoli Casserole to make it your own—more vegetables, extra cheese, a little spice, or something completely different?
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