If you are looking for an easy comfort-food dinner made with tender chicken, broccoli, creamy sauce, and plenty of melted cheese, this Creamy Cheesy Chicken & Broccoli Casserole is a perfect recipe to make. Juicy chicken and crisp-tender broccoli are folded into a homemade garlic cream sauce, topped with cheddar, mozzarella, Parmesan, and buttery breadcrumbs, then baked until hot, bubbling, and golden.
This casserole is ideal for busy weeknights, family dinners, meal prep, or using up leftover cooked chicken. It is hearty enough to serve on its own but also pairs beautifully with rice, mashed potatoes, pasta, or warm dinner rolls.
One of the best things about this recipe is how flexible it is. You can add rice, mushrooms, bacon, cauliflower, spinach, or extra cheese depending on what you have available.
Why You’ll Love This Creamy Cheesy Chicken & Broccoli Casserole
This casserole combines simple ingredients into a warm, satisfying dinner that is easy to prepare.
Using cooked chicken keeps the preparation quick, making rotisserie chicken an excellent shortcut.
Broccoli adds color, texture, and freshness while balancing the rich cheese sauce.
The homemade creamy sauce is made with butter, garlic, broth, milk, sour cream, and Parmesan, giving you plenty of flavor without relying on canned soup.
Cheddar and mozzarella create a gooey, cheesy topping, while buttery breadcrumbs add a lightly crispy finish.
Ingredients
For the Chicken and Broccoli
- 3 cups cooked chicken, shredded or diced
- 4 cups broccoli florets
- 1 tablespoon olive oil
- ½ teaspoon kosher salt
- ¼ teaspoon freshly ground black pepper
- ½ teaspoon garlic powder
For the Creamy Sauce
- 3 tablespoons unsalted butter
- 1 small yellow onion, finely diced
- 4 garlic cloves, finely minced
- 3 tablespoons all-purpose flour
- 1½ cups low-sodium chicken broth
- 1 cup whole milk
- ½ cup sour cream
- 1 teaspoon Dijon mustard
- 1 teaspoon Italian seasoning
- ½ teaspoon onion powder
- ¼ teaspoon smoked paprika
- ½ teaspoon freshly ground black pepper
- Salt, to taste
For the Cheese
- 1½ cups shredded sharp cheddar cheese, divided
- 1 cup shredded mozzarella cheese, divided
- ½ cup freshly grated Parmesan cheese
For the Crispy Topping
- ¾ cup panko breadcrumbs
- 2 tablespoons melted butter
- ¼ cup freshly grated Parmesan cheese
- 1 tablespoon chopped fresh parsley
How to Make Creamy Cheesy Chicken & Broccoli Casserole
1. Preheat the Oven
Preheat your oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish with butter or cooking spray.
2. Prepare the Broccoli
Bring a large pot of lightly salted water to a boil.
Add the broccoli florets and blanch for approximately 2 minutes.
The broccoli should become bright green but remain slightly firm.
3. Cool the Broccoli
Drain the broccoli immediately.
Rinse briefly under cold water or transfer it to an ice bath to stop the cooking.
Drain very thoroughly.
Removing excess water is important because watery broccoli can thin the casserole sauce.
4. Prepare the Chicken
Place the cooked chicken in a large mixing bowl.
Add the broccoli.
Season lightly with garlic powder, salt, and black pepper.
Set aside.
5. Cook the Onion
Melt the butter in a large skillet over medium heat.
Add the diced onion.
Cook for approximately 3–4 minutes, stirring occasionally, until softened.
6. Add the Garlic
Add the minced garlic.
Cook for approximately 30–60 seconds, just until fragrant.
Do not let the garlic brown heavily.
7. Add the Flour
Sprinkle the flour over the onions and garlic.
Stir continuously for approximately 1 minute.
The flour should absorb the butter and form a smooth paste.
8. Add the Chicken Broth
Slowly pour in the chicken broth while whisking.
Continue whisking until the mixture becomes smooth.
9. Add the Milk
Pour in the milk gradually.
Continue stirring over medium heat.
Cook for approximately 3–5 minutes, until the sauce begins to thicken.
10. Add the Seasonings
Stir in Dijon mustard, Italian seasoning, onion powder, smoked paprika, black pepper, and a small amount of salt.
Taste carefully because the cheeses will add additional saltiness.
11. Add the Sour Cream
Reduce the heat to low.
Stir in the sour cream.
Mix until completely smooth.
Avoid boiling the sauce aggressively after adding dairy.
12. Add Parmesan
Stir in the Parmesan gradually.
Continue stirring until melted.
13. Add Cheddar and Mozzarella
Stir in:
- 1 cup cheddar
- ½ cup mozzarella
Reserve the remaining cheese for the topping.
Keep the heat low and stir until smooth and creamy.
14. Combine the Filling
Pour the creamy cheese sauce over the chicken and broccoli.
Fold gently until everything is evenly coated.
15. Transfer to the Baking Dish
Spoon the mixture into the prepared casserole dish.
Spread it evenly.
16. Add the Remaining Cheese
Sprinkle the remaining cheddar and mozzarella over the top.
Make sure the casserole is evenly covered.
17. Make the Breadcrumb Topping
In a small bowl, combine the panko breadcrumbs, melted butter, Parmesan, and parsley.
Mix until the breadcrumbs are evenly coated.
18. Add the Topping
Sprinkle the breadcrumb mixture over the cheese.
This gives the casserole a crisp, golden finish.
19. Bake
Place the casserole in the preheated oven.
Bake uncovered for approximately 25–30 minutes.
The sauce should be bubbling around the edges and the cheese should be completely melted.
20. Broil for Extra Browning
For a deeper golden crust, broil for approximately 1–2 minutes.
Watch carefully so the breadcrumbs do not burn.
21. Check the Center
If the casserole was assembled with chilled ingredients, make sure the center is piping hot before serving.
Any chicken used should have originally been cooked to 165°F (74°C).
22. Rest
Remove the casserole from the oven.
Let it rest for approximately 5–10 minutes.
This helps the sauce thicken slightly and makes serving easier.
23. Garnish and Serve
Sprinkle with fresh parsley and extra Parmesan.
Serve warm.
What to Serve With Creamy Cheesy Chicken & Broccoli Casserole
This casserole can easily be served as a complete meal.
For a heartier dinner, pair it with:
- Steamed white or brown rice
- Garlic mashed potatoes
- Buttered egg noodles
- Roasted baby potatoes
- Garlic bread
- Dinner rolls
For something lighter, serve it with a simple green salad, cucumber salad, roasted asparagus, or green beans.
Tips for the Best Chicken & Broccoli Casserole
Use cooked chicken to keep preparation simple.
Rotisserie chicken works especially well.
Blanch broccoli only briefly so it does not become mushy during baking.
Drain broccoli thoroughly.
Keep the sauce over gentle heat after adding dairy.
Use freshly grated cheese for smoother melting.
Do not over-salt before the cheese is added.
Use sharp cheddar for stronger flavor.
Let the casserole rest before serving.
Broil only briefly to avoid burning the topping.
Easy Recipe Variations
Chicken Broccoli Rice Casserole
Add 2–3 cups cooked rice to the chicken and broccoli before mixing with the sauce.
Bacon Chicken Broccoli Casserole
Add ½ cup crispy crumbled bacon.
Garlic Parmesan Chicken Casserole
Increase the garlic and Parmesan and reduce the cheddar slightly.
Mushroom Chicken Broccoli Casserole
Sauté 8 ounces sliced mushrooms with the onions.
Spicy Chicken Casserole
Add red pepper flakes, cayenne pepper, or diced jalapeños.
Chicken Broccoli Pasta Bake
Add approximately 8 ounces cooked penne or rotini.
Cook the pasta slightly under al dente before mixing.
Cauliflower Chicken Casserole
Replace half or all of the broccoli with cauliflower florets.
Extra Cheesy Chicken Casserole
Add Monterey Jack, Gruyère, or provolone along with the cheddar and mozzarella.
How to Store Leftovers
Allow the casserole to cool before transferring leftovers to an airtight container.
Refrigerate for up to 3–4 days.
For reheating, place individual portions in the microwave or warm the casserole in a 350°F (175°C) oven until heated through.
If the sauce seems thick after refrigeration, add a small splash of milk or chicken broth before reheating.
For freezing, assemble the casserole without the breadcrumb topping and freeze tightly covered for up to approximately 2–3 months.
Thaw overnight in the refrigerator, add the breadcrumb topping, and bake until hot and bubbling.
Frequently Asked Questions
Can I use rotisserie chicken?
Yes.
Rotisserie chicken is one of the easiest options. Use approximately 3 cups shredded chicken.
Can I use frozen broccoli?
Yes.
Thaw it completely and drain it very well before adding it to the casserole.
Can I add rice?
Absolutely.
Add 2–3 cups cooked rice for a hearty chicken broccoli rice casserole.
Why is my casserole watery?
The broccoli may have contained too much moisture, or the sauce may not have thickened enough before baking.
Drain vegetables thoroughly and cook the sauce until it lightly coats the back of a spoon.
Can I use cream cheese?
Yes.
Add 2–4 ounces softened cream cheese to the sauce for an even richer texture.
Can I prepare this ahead?
Yes.
Assemble the casserole, cover, and refrigerate for up to a day.
Add the breadcrumb topping shortly before baking.
Can I use chicken thighs?
Yes.
Cooked boneless chicken thighs work very well and stay especially juicy.
Can I leave off the breadcrumbs?
Absolutely.
Simply top with additional cheese and bake until bubbling and golden.
Final Thoughts
This Creamy Cheesy Chicken & Broccoli Casserole combines tender chicken, crisp-tender broccoli, garlic cream sauce, cheddar, mozzarella, Parmesan, and buttery breadcrumbs in one easy family-style dinner.
The key is keeping the broccoli from overcooking, making the sauce thick and creamy before assembly, and letting the casserole rest briefly after baking.
Serve it with rice, mashed potatoes, garlic bread, or a fresh salad for a cozy, cheesy dinner that is easy enough for weeknights and satisfying enough for the whole family.