Tender chicken, bright green broccoli, creamy cheddar sauce, and a crisp buttery breadcrumb topping make this chicken and broccoli casserole an easy comfort-food dinner for busy evenings.
Instead of relying on canned soup, this version starts with a simple homemade cheese sauce made from butter, flour, milk, chicken broth, garlic, and sharp cheddar. It takes only a few extra minutes and gives the casserole a creamy texture with plenty of real cheese flavor.
Use leftover chicken, rotisserie chicken, or chicken breasts cooked specifically for the recipe. Once the components are ready, everything goes into one baking dish and cooks until hot, bubbly, and golden.
🥦 Chicken and Broccoli Casserole Recipe
Prep time: 20 minutes
Bake time: 25–30 minutes
Total time: About 50 minutes
Servings: 6
Oven temperature: 375°F (190°C)
🛒 Ingredients
For the Casserole
- 3 cups cooked chicken, chopped or shredded
- 4 cups broccoli florets
- 3 tablespoons unsalted butter
- 3 cloves garlic, minced
- 3 tablespoons all-purpose flour
- 2 cups whole milk
- 1 cup low-sodium chicken broth
- 1 teaspoon Dijon mustard
- 1/2 teaspoon dried thyme
- 1/2 teaspoon garlic powder
- 1/4 teaspoon onion powder
- 2 cups freshly shredded sharp cheddar cheese
- 1/2 cup grated Parmesan cheese
- 1/2 teaspoon salt, plus more to taste
- Freshly ground black pepper
For the Crispy Topping
- 3/4 cup panko breadcrumbs
- 2 tablespoons melted butter
- 1/4 cup grated Parmesan cheese
🍗 Prepare the Chicken
You will need about 3 cups of cooked chicken for this casserole.
Leftover roasted or baked chicken works beautifully, and rotisserie chicken makes the recipe especially convenient. Remove the skin and bones, then chop or shred the meat into bite-size pieces.
If you are starting with raw chicken breasts, cook them before assembling the casserole. Season the chicken lightly with salt and pepper and bake, poach, or sauté until it reaches an internal temperature of 165°F.
Let the chicken rest briefly before chopping it.
🥦 Prepare the Broccoli
Bring a large pot of lightly salted water to a boil.
Add the broccoli florets and cook for about 2 minutes, just until they become bright green and begin to soften.
Immediately drain the broccoli and rinse briefly with cold water to stop the cooking.
The broccoli should still be fairly firm at this point because it will continue cooking in the casserole.
Drain it thoroughly. Excess water trapped in the broccoli can thin the cheese sauce and make the finished casserole watery.
🧀 Make the Creamy Cheese Sauce
Melt the butter in a large saucepan over medium heat.
Add the minced garlic and cook for about 30 seconds, stirring constantly, until fragrant.
Sprinkle in the flour and whisk continuously for about 1 minute. This creates the roux that thickens the sauce.
Slowly pour in the milk while whisking, followed by the chicken broth.
Continue cooking for about 4 to 6 minutes, stirring frequently, until the sauce has thickened enough to lightly coat the back of a spoon.
Stir in the Dijon mustard, thyme, garlic powder, onion powder, salt, and several grinds of black pepper.
Remove the saucepan from the heat.
Add the cheddar gradually, stirring after each addition until melted and smooth. Stir in the Parmesan.
Taste the sauce and adjust the seasoning if needed.
🥘 Assemble the Casserole
Lightly grease a 9-by-13-inch or similar 3-quart baking dish.
Add the cooked chicken and broccoli and distribute them evenly throughout the dish.
Pour the warm cheddar sauce over everything.
Gently stir or fold the ingredients together so the chicken and broccoli are evenly coated with sauce.
Smooth the mixture into an even layer.
🥖 Make the Buttery Breadcrumb Topping
Combine the panko breadcrumbs, melted butter, and Parmesan in a small bowl.
Stir until the crumbs are evenly coated.
Scatter the breadcrumb mixture across the top of the casserole.
Panko gives the casserole an especially crisp topping, but ordinary dry breadcrumbs can be used if that is what you have on hand.
🔥 Bake Until Golden and Bubbly
Bake the casserole at 375°F for about 25 to 30 minutes.
It should be bubbling around the edges, hot in the center, and lightly golden across the top.
For an extra-crisp topping, place the casserole under the broiler for a minute or two at the end. Watch it carefully because breadcrumbs can brown very quickly.
For food safety, casseroles containing poultry should reach 165°F in the center before serving.
Let the casserole rest for about 5 minutes before spooning it onto plates.
🧀 What Cheese Is Best for Chicken and Broccoli Casserole?
Sharp cheddar is an excellent choice because it has enough flavor to stand up to the chicken and broccoli.
For the smoothest sauce, shred your own cheese from a block. Pre-shredded cheese often contains anti-caking ingredients that can make melted cheese sauces slightly less smooth.
You can also combine cheeses.
Monterey Jack makes the sauce especially creamy, while Gruyère adds a nutty flavor. A little Parmesan provides additional savory depth.
Try replacing half of the cheddar with another good melting cheese if you want to experiment.
🥦 Can You Use Frozen Broccoli?
Yes.
Frozen broccoli makes this casserole even more convenient, but it generally has a softer texture than fresh broccoli.
Thaw the broccoli first and drain it very thoroughly. Pat away as much excess moisture as possible before adding it to the baking dish.
There is no need to blanch frozen broccoli before assembling the casserole.
If you prefer broccoli with more bite, fresh florets are the better option.
🍗 Can You Use Rotisserie Chicken?
Absolutely. This is one of the easiest ways to get the casserole into the oven quickly.
Remove the meat from the rotisserie chicken and chop or shred it into bite-size pieces.
A mixture of white and dark meat works particularly well because the dark meat adds a little extra richness and stays especially tender during reheating.
You can also freeze leftover cooked chicken in recipe-size portions so it is ready whenever you want to make a casserole.
🍚 Add Rice for a Heartier Casserole
If you want to turn the dish into a chicken, broccoli, and rice casserole, stir in about 2 cups of cooked rice before baking.
White rice, brown rice, or wild-rice blends can all work.
Because rice absorbs some of the sauce, you may want to add an extra 1/2 cup of milk or chicken broth if you include a full 2 cups of cooked rice.
Do not use uncooked rice in this version. The liquid proportions and baking time are designed for already-cooked ingredients.
🍝 Add Pasta Instead
Cooked pasta is another easy addition.
Short shapes such as penne, rotini, shells, or bow ties work particularly well because the sauce settles into their ridges and curves.
Add about 2 to 3 cups of cooked pasta to the chicken and broccoli before pouring over the sauce.
Cook the pasta slightly firmer than you normally would because it will soften a little more in the oven.
🌽 Easy Vegetable Additions
Broccoli does not have to be the only vegetable in the casserole.
Sautéed mushrooms, peas, carrots, spinach, cauliflower, or corn can all be added.
If using mushrooms or other vegetables that contain a lot of water, cook them first so they do not release excess liquid into the casserole.
For frozen vegetables, thaw and drain them before adding whenever possible.
🌶️ Easy Flavor Variations
For a little heat, stir a pinch of red pepper flakes or a finely chopped jalapeño into the sauce.
For extra smokiness, add 1/2 teaspoon smoked paprika.
Cooked bacon makes a particularly indulgent addition. Crumble several strips and mix them into the chicken and broccoli or scatter them over the top just before serving.
You can also replace the thyme with Italian seasoning or add fresh parsley, chives, or green onions after the casserole comes out of the oven.
🥖 Other Topping Ideas
Panko and Parmesan make a simple crispy topping, but there are plenty of alternatives.
Crushed buttery crackers create a richer topping. Crushed cornflakes become especially crisp, while extra cheddar makes the surface gooier and cheesier.
You can also combine breadcrumbs with chopped almonds or pecans for additional crunch.
If you prefer an entirely creamy casserole, simply leave the topping off and sprinkle a little extra cheddar over the surface instead.
🥗 What to Serve with Chicken and Broccoli Casserole
Because chicken, broccoli, and cheese already make this a substantial dish, simple sides work best.
Serve it with a crisp green salad, roasted vegetables, sliced tomatoes, or crusty bread.
If you have not added rice or pasta directly to the casserole, steamed rice, egg noodles, mashed potatoes, or baked potatoes can make the meal more filling.
For a lighter dinner, serve a generous portion of casserole with nothing more than a fresh salad.
⏰ Can You Make It Ahead?
Yes. Chicken and broccoli casserole is well suited to advance preparation.
Assemble the chicken, broccoli, and cheese sauce in the baking dish, then cover and refrigerate.
Keep the breadcrumb topping separate so it does not absorb moisture and become soggy.
When you are ready to bake, sprinkle the topping over the casserole and place it in the oven.
A casserole going directly from the refrigerator will generally need additional baking time. Make sure the center reaches 165°F before serving.
❄️ How to Store Leftover Chicken Casserole
Transfer leftovers to an airtight container and refrigerate promptly.
Cooked chicken casseroles can generally be kept refrigerated for 3 to 4 days.
Reheat individual portions in the microwave or warm the casserole, covered, in the oven until it reaches 165°F.
The breadcrumb topping will soften somewhat in the refrigerator, but reheating the casserole uncovered for the final few minutes can help restore a little crispness.
🧊 Can You Freeze Chicken and Broccoli Casserole?
Yes.
For the best results, freeze the casserole without the breadcrumb topping.
Assemble the chicken, broccoli, and sauce in a freezer-safe baking dish and allow everything to cool before covering securely.
Freeze for up to about 3 months for best quality.
Thaw overnight in the refrigerator, add the fresh breadcrumb topping, and bake until hot throughout.
You can also freeze individual portions of cooked casserole for quick lunches or dinners.
🥦 An Easy Comfort-Food Dinner
Chicken and broccoli is a classic combination because the mild chicken, fresh-tasting broccoli, and rich cheese sauce balance one another so well.
Add a crisp layer of buttery Parmesan breadcrumbs and you have a casserole that feels comforting without requiring canned soup or complicated ingredients.
It is also an excellent recipe for leftover chicken. Assemble everything ahead when necessary, add rice or pasta when you want a heartier meal, and keep this recipe handy for nights when a warm, cheesy casserole sounds exactly right.
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