Looking for a quick, creamy, and cheesy dinner that doesn’t require a lot of work? This Chicken Broccoli Alfredo Casserole is the perfect recipe for a busy weeknight.
Made with tender cooked chicken, steamed broccoli, creamy Alfredo sauce, Italian seasoning, garlic powder, and plenty of melted mozzarella, this simple casserole comes together in just a few minutes before going into the oven. The result is a warm, comforting dish with creamy sauce throughout and a golden, bubbly layer of cheese on top.
The best part? You don’t need to start with raw chicken or make a complicated sauce. Using cooked chicken and your favorite Alfredo sauce makes this recipe incredibly convenient. It’s also a great way to use leftover chicken or rotisserie chicken from the grocery store.
Why You’ll Love This Chicken Broccoli Alfredo Casserole
There are plenty of reasons to keep this recipe in your regular dinner rotation.
It’s incredibly easy. Everything is mixed together in one baking dish, topped with mozzarella, and baked until hot and bubbly.
It’s ready quickly. Since the chicken and broccoli are already cooked, most of the work is simply assembling the casserole.
It’s creamy and cheesy. Alfredo sauce gives the chicken and broccoli a rich, creamy texture, while mozzarella creates a deliciously gooey topping.
It’s family-friendly. The combination of chicken, broccoli, Alfredo sauce, and melted cheese is comforting and familiar, making it a great choice for family dinners.
It’s perfect for leftovers. Store any leftovers in the refrigerator and reheat them for an easy lunch or dinner the next day.
Ingredients You’ll Need
You only need a handful of simple ingredients to make this easy chicken casserole.
Cooked Chicken
You’ll need 2 cups of cooked chicken, diced into bite-sized pieces. Rotisserie chicken works especially well because it’s already cooked and flavorful. You can also use leftover baked or grilled chicken.
Broccoli
Use 16 ounces of steamed broccoli. Steam the broccoli until tender but not overly soft. You want it to maintain a little texture after baking.
Alfredo Sauce
1/2 cup of Alfredo sauce gives the casserole its creamy, rich base. You can use your favorite store-bought Alfredo sauce or homemade Alfredo sauce.
Mozzarella Cheese
Add 1/2 cup shredded mozzarella cheese, or more if you love an extra-cheesy casserole. Mozzarella melts beautifully and gives the finished dish that golden, bubbly topping.
Seasonings
A simple combination of 1 tablespoon Italian seasoning and garlic powder adds plenty of flavor without making the recipe complicated.
How to Make Chicken Broccoli Alfredo Casserole
1. Preheat the Oven
Preheat your oven to 375°F.
Lightly grease a baking dish with nonstick cooking spray or a small amount of oil. This will make serving and cleanup easier.
2. Combine the Chicken and Broccoli
Add the 2 cups of diced cooked chicken and 16 ounces of steamed broccoli to your baking dish.
Try to cut the chicken and broccoli into similar bite-sized pieces so every serving gets a little of everything.
3. Add the Alfredo Sauce
Pour the 1/2 cup Alfredo sauce over the chicken and broccoli.
Sprinkle in the Italian seasoning and garlic powder. Stir everything together until the chicken and broccoli are evenly coated with the creamy sauce and seasonings.
If the mixture looks a little dry, you can add a small amount of extra Alfredo sauce. The goal is for everything to be lightly coated without becoming overly soupy.
4. Add the Mozzarella
Spread the mixture into an even layer.
Sprinkle the shredded mozzarella generously over the top. Don’t be afraid to add a little extra cheese if you want a particularly gooey topping.
5. Bake Covered
Cover the baking dish tightly with aluminum foil.
Bake at 375°F for 20 minutes. Covering the casserole helps keep the chicken moist while the ingredients heat through.
6. Broil Until Golden
After 20 minutes, carefully remove the foil.
Turn your oven to the broil setting and broil the casserole for approximately 2–3 minutes, watching it closely.
The cheese should become melted, golden, and bubbly.
Because broilers can vary significantly in intensity, don’t walk away during this step. The cheese can go from perfectly golden to burned very quickly.
7. Serve
Remove the casserole from the oven and let it rest for a few minutes before serving.
Spoon the creamy chicken and broccoli onto plates while the cheese is still warm and gooey.
Tips for the Best Chicken Broccoli Alfredo Casserole
Use leftover chicken. This recipe is a great way to turn leftover chicken into a completely different meal.
Don’t overcook the broccoli. Steam it until tender, but avoid making it extremely soft. It will continue cooking in the oven.
Shred your own mozzarella when possible. Freshly shredded mozzarella generally melts beautifully and gives the casserole a smooth, gooey topping.
Watch the broiler. The final broiling step is what creates that irresistible golden cheese crust, but it only takes a couple of minutes.
Adjust the seasoning. Alfredo sauce can vary in saltiness and flavor from brand to brand, so taste the mixture before baking if you want to adjust the garlic powder or Italian seasoning.
What Kind of Chicken Should You Use?
Almost any cooked chicken works in this recipe.
Rotisserie chicken is one of the easiest choices because you can simply remove the meat, dice it, and add it directly to the casserole.
Leftover roasted chicken, baked chicken breast, grilled chicken, or even leftover chicken thighs can also be used.
For the best texture, cut the chicken into small bite-sized pieces rather than large chunks.
Can I Use Frozen Broccoli?
Yes. Frozen broccoli can be a convenient substitute for fresh broccoli.
Steam or microwave the broccoli according to the package directions, then drain any excess water before adding it to the casserole.
Removing excess moisture is important because too much water can make the finished casserole thinner than you’d like.
What to Serve With Chicken Broccoli Alfredo Casserole
This casserole can easily be served as a complete meal, but you can add a simple side if you’d like.
Try serving it with:
- Garlic bread
- A simple green salad
- Dinner rolls
- Roasted vegetables
- Steamed green beans
- A light cucumber salad
Garlic bread is especially delicious because it gives you something to soak up any extra creamy Alfredo sauce.
How to Store Leftovers
Allow the casserole to cool before transferring leftovers to an airtight container.
Store in the refrigerator for up to 3–4 days.
When you’re ready to eat, reheat individual portions in the microwave until heated through. You can also reheat the casserole in the oven if you’re warming a larger portion.
If the casserole seems a little dry after refrigeration, adding a small spoonful of Alfredo sauce before reheating can help bring back some of its creamy texture.
Easy Variations
This recipe is simple enough that you can easily customize it.
Add Pasta
For a heartier meal, mix in cooked penne, rotini, shells, or another short pasta. Chicken, broccoli, and Alfredo sauce pair especially well with pasta.
Add Parmesan
Sprinkle grated Parmesan over the mozzarella before baking for an extra cheesy, savory flavor.
Add More Vegetables
You can add vegetables such as mushrooms, spinach, bell peppers, or cauliflower.
Make It Extra Cheesy
If you’re a serious cheese lover, increase the mozzarella or add a combination of mozzarella and Parmesan.
Frequently Asked Questions
Can I make this casserole ahead of time?
Yes. You can assemble the casserole ahead of time, cover it, and refrigerate it until you’re ready to bake. If it is very cold when it goes into the oven, it may need a little additional heating time.
Can I use rotisserie chicken?
Absolutely. Rotisserie chicken is one of the easiest options for this recipe and adds plenty of flavor without requiring additional cooking.
Can I use homemade Alfredo sauce?
Yes. Homemade Alfredo sauce works beautifully, although your favorite refrigerated or jarred Alfredo sauce is a convenient shortcut.
Why do I cover the casserole with foil?
Covering the casserole during the first part of baking helps the ingredients heat through while preventing the cheese from browning too quickly. The foil is removed before broiling so the mozzarella can become golden and bubbly.
Can I add pasta?
Definitely. Adding cooked pasta turns this into an even heartier chicken Alfredo pasta bake. Penne, rotini, shells, and other short pasta shapes work particularly well.
Final Thoughts
This easy Chicken Broccoli Alfredo Casserole proves that dinner doesn’t have to be complicated to be delicious. With just a few ingredients and minimal preparation, you can create a creamy, cheesy, comforting meal that works perfectly for busy weeknights.
Tender chicken, flavorful broccoli, creamy Alfredo sauce, and golden melted mozzarella come together in one warm and satisfying dish. Whether you’re using leftover chicken or picking up a rotisserie chicken on the way home, this recipe is an easy way to get dinner on the table without spending hours in the kitchen.
If you’re looking for a simple comfort-food dinner that the whole family can enjoy, this chicken broccoli Alfredo casserole is definitely worth adding to your recipe collection.
