Cheesy Chicken Broccoli Casserole

This cheesy chicken broccoli casserole is a warm, creamy, and comforting family dinner made with tender chicken, fresh broccoli, creamy sauce, and plenty of melted cheddar cheese.

Everything is baked together until bubbling and golden on top, creating an easy casserole that’s perfect for busy weeknights.

It’s a simple way to turn everyday ingredients into a hearty homemade meal. Serve it with a fresh green salad, warm bread, or roasted vegetables for a complete dinner.

Why You’ll Love This Cheesy Chicken Broccoli Casserole

Easy family dinner
Creamy and cheesy
Packed with tender chicken and broccoli
Simple ingredients
Great weeknight recipe
Make-ahead friendly
Perfect for leftovers
Freezer-friendly
Easy to customize
Comforting homemade flavor

Ingredients

For the Chicken and Broccoli

1 1/2 pounds boneless, skinless chicken breasts
4 cups fresh broccoli florets
1 tablespoon olive oil
1 teaspoon garlic powder
1/2 teaspoon onion powder
1/2 teaspoon paprika
1/2 teaspoon salt
1/4 teaspoon black pepper

For the Creamy Sauce

2 tablespoons butter
3 cloves garlic, minced
3 tablespoons all-purpose flour
2 cups whole milk
1 cup chicken broth
1/2 cup sour cream
1 teaspoon Dijon mustard
1/2 teaspoon Italian seasoning
1/2 teaspoon salt
1/4 teaspoon black pepper

For the Cheese

2 cups shredded sharp cheddar cheese
1/2 cup shredded Monterey Jack cheese
1/4 cup grated Parmesan cheese

For the Topping

1/2 cup shredded cheddar cheese
2 tablespoons grated Parmesan
2 tablespoons chopped fresh parsley

How to Make Cheesy Chicken Broccoli Casserole

1. Preheat the Oven

Preheat your oven to 375°F.

Lightly grease a 9×13-inch baking dish with butter or nonstick cooking spray.

2. Prepare the Chicken

Pat the chicken breasts dry with paper towels.

Cut them into bite-sized pieces.

Try to keep the pieces relatively similar in size so they cook evenly.

3. Season the Chicken

Place the chicken pieces in a large bowl.

Add olive oil, garlic powder, onion powder, paprika, salt, and black pepper.

Toss until the chicken is evenly coated.

4. Cook the Chicken

Heat a large skillet over medium-high heat.

Add the seasoned chicken.

Cook for approximately 5–7 minutes, stirring occasionally, until the outside is lightly golden and the chicken is nearly cooked through.

Transfer the chicken to a clean plate.

The chicken will finish cooking in the casserole.

5. Prepare the Broccoli

Bring a pot of water to a boil.

Add the broccoli florets and blanch for approximately 2 minutes.

Drain immediately.

You want the broccoli to remain bright green and slightly crisp because it will continue cooking in the oven.

6. Make the Creamy Sauce

Melt the butter in a large saucepan over medium heat.

Add the minced garlic and cook for about 30 seconds.

Sprinkle in the flour.

Whisk continuously for about 1 minute to create a smooth roux.

7. Add the Milk and Broth

Slowly pour in the milk while whisking.

Add the chicken broth.

Continue whisking until the sauce becomes smooth.

Cook for approximately 3–5 minutes until slightly thickened.

8. Add the Flavor

Reduce the heat to low.

Stir in sour cream, Dijon mustard, Italian seasoning, salt, and black pepper.

Mix until smooth.

Avoid boiling the sauce after adding the sour cream.

9. Add the Cheese

Remove the saucepan from the heat.

Add 2 cups of shredded cheddar, Monterey Jack, and Parmesan.

Stir until the cheese melts into a smooth, creamy sauce.

10. Combine the Ingredients

Add the cooked chicken and blanched broccoli to the prepared baking dish.

Pour the creamy cheese sauce evenly over everything.

Gently toss or spread the ingredients so the chicken and broccoli are coated.

11. Add the Cheese Topping

Sprinkle the remaining cheddar cheese over the top.

Add Parmesan for extra flavor and browning.

12. Bake

Cover the casserole loosely with aluminum foil.

Bake for approximately 20 minutes.

Remove the foil and continue baking for another 10–15 minutes, until the cheese is melted, bubbling, and lightly golden.

13. Rest Before Serving

Remove the casserole from the oven.

Let it rest for approximately 10 minutes.

This allows the creamy sauce to thicken slightly and makes serving easier.

14. Garnish and Serve

Sprinkle fresh parsley over the top.

Serve warm with your favorite side dishes.

What Kind of Chicken Should I Use?

Boneless, skinless chicken breasts work very well because they are lean and easy to cut into bite-sized pieces.

Boneless chicken thighs are also an excellent option and tend to remain especially juicy.

Can I Use Rotisserie Chicken?

Yes.

Rotisserie chicken is an excellent shortcut.

Simply shred or chop the cooked chicken and add it directly to the casserole.

Since the chicken is already cooked, you can skip the skillet cooking step.

Can I Use Frozen Broccoli?

Yes.

Frozen broccoli can be used when fresh broccoli isn’t available.

Thaw and drain it well before adding it to the casserole.

Excess water can make the sauce thinner.

Can I Add Rice?

Absolutely.

Adding cooked rice turns this into an even heartier one-dish meal.

Add approximately 2–3 cups of cooked rice when combining the chicken, broccoli, and sauce.

Easy Cheesy Chicken Broccoli Casserole Variations

Chicken Broccoli Rice Casserole

Add cooked white or brown rice for a complete one-dish dinner.

Chicken Broccoli Pasta Casserole

Add cooked penne, rotini, or elbow macaroni.

Ranch Chicken Broccoli Casserole

Add a small amount of ranch seasoning to the creamy sauce.

Garlic Parmesan Chicken Broccoli Casserole

Increase the Parmesan and add extra fresh garlic.

Spicy Chicken Broccoli Casserole

Add red pepper flakes or diced jalapeños.

Bacon Chicken Broccoli Casserole

Add cooked crumbled bacon before baking.

Mushroom Chicken Broccoli Casserole

Sauté sliced mushrooms with the chicken before assembling.

Low-Carb Chicken Broccoli Casserole

Skip the rice and pasta and increase the amount of broccoli.

Can I Make This Casserole Ahead of Time?

Yes.

Assemble the casserole, cover it tightly, and refrigerate for up to 24 hours before baking.

Because the casserole starts cold, it may require additional baking time.

For the best texture, allow the casserole to sit at room temperature briefly while the oven preheats.

Can I Freeze Cheesy Chicken Broccoli Casserole?

Yes.

For best results, assemble the casserole without baking.

Wrap it tightly and freeze for up to 2 months.

Thaw overnight in the refrigerator before baking.

You can also freeze fully baked leftovers in individual portions.

How to Store Leftovers

Allow the casserole to cool before transferring leftovers to an airtight container.

Refrigerate for up to 4 days.

How to Reheat

For individual portions, microwave until heated through.

For a larger portion, cover the casserole with foil and warm it in a 350°F oven.

If the sauce has thickened too much, add a small splash of milk before reheating.

How Do I Prevent the Sauce From Becoming Watery?

Drain broccoli thoroughly before adding it.

If using frozen broccoli, thaw and squeeze out excess moisture.

Don’t add too much liquid to the sauce.

Allowing the casserole to rest after baking also helps the sauce set.

Can I Use Different Cheese?

Absolutely.

Good options include:

Cheddar
Monterey Jack
Colby Jack
Mozzarella
Gruyère
Pepper Jack
Parmesan

A combination of sharp cheddar and Monterey Jack provides a great balance of flavor and meltability.

What to Serve With Chicken Broccoli Casserole

This casserole is filling on its own, but simple sides work beautifully.

Try:

Garlic bread
Green salad
Dinner rolls
Roasted potatoes
Steamed vegetables
Fresh fruit
Caesar salad
Brown rice

Frequently Asked Questions

Can I use leftover chicken?

Yes. Cooked rotisserie chicken or leftover roasted chicken works perfectly.

Can I use frozen broccoli?

Yes. Thaw and drain it thoroughly before adding it.

Can I make this without flour?

Yes. You can thicken the sauce with cornstarch or use a cream-based sauce instead.

Can I use milk instead of whole milk?

Yes. Whole milk gives the creamiest result, but 2% milk can also work.

Can I make this gluten-free?

Yes. Use gluten-free flour or a suitable gluten-free thickener and verify that your other ingredients are gluten-free.

Can I make this dairy-free?

Yes, although the texture and flavor will change. Use dairy-free butter, milk, sour cream, and cheese alternatives.

Why is my casserole watery?

The most common causes are excess moisture from broccoli or an overly thin sauce. Drain vegetables thoroughly and allow the casserole to rest before serving.

Can I add pasta?

Yes. Cooked pasta such as penne, rotini, or shells makes this an even heartier casserole.

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