This Cheesy Chicken and Broccoli Casserole is a creamy, comforting dinner made with tender chicken, fresh broccoli florets, rich Alfredo sauce, and a generous layer of melted cheese. Baked until bubbly and golden, this easy chicken casserole delivers delicious flavor with minimal preparation.
Perfect for busy weeknights, family dinners, or meal prep, this oven-baked recipe uses simple ingredients and comes together in just a few steps. The combination of mozzarella, Parmesan, and creamy Alfredo sauce creates a rich, savory dish that pairs beautifully with a fresh salad or roasted vegetables.
Recipe Overview
| Detail | Information |
| Preparation Time | 15 minutes |
| Cooking Time | 20–25 minutes |
| Broccoli Blanching Time | 2–3 minutes |
| Total Time | Approximately 40–45 minutes |
| Servings | 6 |
| Course | Main Course |
| Cuisine | American-inspired |
| Cooking Method | Oven-baked |
| Difficulty | Easy |
Why You’ll Love This Recipe
This cheesy chicken and broccoli casserole is easy to prepare, wonderfully creamy, and packed with satisfying ingredients. Using cooked chicken makes preparation faster, while broccoli adds color, texture, and nutrients. The melted mozzarella and Parmesan create a golden, cheesy topping that makes this dish ideal for family dinners, low-carb meal planning, and convenient leftovers.
Ingredients
For the Casserole
| Ingredient | Quantity |
| Cooked chicken breast, shredded or cubed | 4 cups (approximately 600–700 g) |
| Fresh broccoli florets | 5 cups (approximately 450–500 g) |
| Alfredo sauce | 2 jars, 15 oz (425 g) each |
| Shredded mozzarella cheese | 2 cups (approximately 200 g) |
| Grated Parmesan cheese | 1/2 cup (approximately 45–50 g) |
| Garlic powder | 1 teaspoon |
| Italian seasoning | 1 teaspoon |
| Salt | To taste |
| Ground black pepper | To taste |
| Butter or nonstick cooking spray | For greasing the baking dish |
Ingredient note: You can use homemade Alfredo sauce instead of store-bought sauce. Mozzarella gives the casserole a stretchy, mild cheese topping, while cheddar creates a stronger flavor. Fresh broccoli works particularly well, but frozen broccoli can also be used after thawing and draining it thoroughly.
Step-by-Step Instructions
Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C). Lightly grease a 9 × 13-inch baking dish with butter or nonstick cooking spray to prevent the casserole from sticking.
If you have not already prepared the chicken, cook it separately until the thickest part reaches an internal temperature of 165°F (74°C). Allow it to cool slightly, then shred or cut it into bite-sized pieces.
Step 2: Blanch the Broccoli
Bring a large pot of lightly salted water to a boil. Add the broccoli florets and cook for 2–3 minutes, just until they become bright green and slightly tender while retaining some firmness.
Drain the broccoli thoroughly and gently pat it dry with a clean kitchen towel or paper towels. Removing excess water helps prevent the casserole from becoming watery during baking.
Step 3: Mix the Chicken and Sauce
In a large mixing bowl, combine the cooked chicken, blanched broccoli, Alfredo sauce, garlic powder, Italian seasoning, salt, and black pepper.
Add half of the shredded mozzarella cheese and stir gently until the chicken and broccoli are evenly coated in the creamy sauce. Taste the mixture and adjust the seasonings if necessary.
Step 4: Assemble the Casserole
Transfer the chicken and broccoli mixture into the prepared baking dish. Spread it evenly with a spoon or spatula so the ingredients form a consistent layer.
Sprinkle the remaining mozzarella cheese over the top, followed by the grated Parmesan. The combination of these cheeses creates a flavorful topping that melts beautifully and develops a lightly golden finish.
Step 5: Bake Until Bubbly
Place the baking dish in the preheated oven and bake for 20–25 minutes, or until the casserole is hot throughout, the sauce is bubbling around the edges, and the cheese has melted.
For a more golden top, switch the oven to broil for the final 1–2 minutes, watching carefully to prevent the cheese from burning. If the ingredients were refrigerated before baking, the casserole may require additional time to heat through.
Step 6: Rest and Serve
Remove the casserole from the oven and let it rest for approximately 5 minutes before serving. This brief resting period allows the sauce to settle and makes the portions easier to serve.
Spoon the cheesy chicken and broccoli into bowls or onto plates. Serve hot while the mozzarella is melted and the Alfredo sauce is creamy.
Best Tips
Drain the broccoli thoroughly before mixing it with the sauce, as excess moisture can make the casserole watery. Use fully cooked chicken cut into evenly sized pieces so every serving contains a balanced amount of chicken and broccoli. For the best cheese texture, shred mozzarella from a block if possible. Avoid overbaking, which can dry out the chicken and cause the sauce to become too thick.
Best Ingredient Options
Chicken breast is lean and works well in this recipe, but cooked chicken thighs can provide a richer flavor. Fresh broccoli offers the best texture, while frozen broccoli is a convenient alternative when properly thawed and drained. Mozzarella creates a stretchy cheese topping, cheddar adds a sharper taste, and Parmesan contributes a savory, slightly nutty flavor. For a lighter sauce, consider a homemade Alfredo made with milk, a moderate amount of cream, Parmesan, and seasonings.
Recipe Variations
For extra flavor, add sautéed mushrooms, diced bell peppers, or a handful of fresh spinach to the chicken mixture. If you enjoy a little heat, add a pinch of crushed red pepper flakes. You can replace some of the mozzarella with cheddar or Monterey Jack for a different cheese combination. For a crunchy topping, sprinkle a small amount of seasoned breadcrumbs over the cheese before baking, although this will increase the carbohydrate content.
What to Serve With
This casserole is filling enough to serve as a main dish on its own, especially for anyone following a lower-carbohydrate eating plan. It also pairs well with a crisp green salad, roasted zucchini, steamed green beans, or cauliflower rice. If you prefer a heartier meal, serve it with rice, pasta, or warm bread to soak up the creamy Alfredo sauce.
Make-Ahead Instructions
To prepare ahead, blanch and drain the broccoli, cook and shred the chicken, and mix the ingredients with the Alfredo sauce and seasonings. Transfer the mixture to the baking dish, cover tightly, and refrigerate for up to 24 hours before baking.
For the best results, add the cheese topping just before baking. If the assembled casserole is cold from the refrigerator, allow extra baking time and check that the center is thoroughly heated before serving. Do not leave the assembled dish at room temperature for extended periods.
Storage Instructions
Allow leftover casserole to cool slightly, then place it in an airtight container and refrigerate within 2 hours of cooking. Store in the refrigerator for up to 3–4 days.
For convenient meal prep, divide the leftovers into individual portions. This makes it easier to reheat only what you need while keeping the remaining casserole properly stored.
Reheating Instructions
For individual portions, microwave on medium power in 30–60-second intervals, stirring or checking between intervals until heated through. If the sauce has thickened, add a small splash of milk or chicken broth to restore its creamy consistency.
To reheat a larger portion, place it in an oven-safe dish, cover with foil, and warm at 325°F (165°C) until hot throughout. Remove the foil during the final few minutes if you want to refresh the cheesy topping. Reheat leftovers to 165°F (74°C).
Freezing Instructions
This casserole can be frozen, although cream-based sauces may separate slightly after thawing. For the best texture, freeze individual portions in airtight, freezer-safe containers for up to 2 months.
Thaw overnight in the refrigerator before reheating. Warm gently in the oven, adding a little milk or chicken broth if needed to loosen the sauce. Avoid repeatedly freezing and thawing the same portion.
Common Mistakes to Avoid
Leaving excess water on the broccoli is one of the main reasons a chicken casserole becomes watery. Using uncooked chicken without adjusting the cooking method can also lead to uneven cooking, so start with fully cooked chicken for this recipe. Avoid adding too much salt before tasting the Alfredo sauce and cheese, since both may already contain sodium. Finally, do not bake the casserole for too long, as overcooking can dry out the chicken and affect the creamy texture.
Nutrition Estimate
The following values are approximate and depend on the brands of Alfredo sauce and cheese used, as well as the final portion size.
| Nutrient | Estimated Amount Per Serving |
| Calories | 450–600 kcal |
| Protein | 35–45 g |
| Carbohydrates | 10–18 g |
| Total Fat | 28–42 g |
| Saturated Fat | 12–20 g |
| Fiber | 3–5 g |
| Sugar | 3–6 g |
| Sodium | 700–1,200 mg |
These estimates assume 6 servings and the use of standard Alfredo sauce, mozzarella, Parmesan, chicken breast, and broccoli. Check product labels for more accurate nutrition information. A lower-sodium sauce or reduced-fat cheese may change the nutritional values.
Frequently Asked Questions
Can I use rotisserie chicken?
Yes. Store-bought rotisserie chicken is a convenient shortcut. Remove the skin and bones, shred the meat, and measure approximately 4 cups before mixing it with the other ingredients.
Can I use frozen broccoli?
Yes. Thaw the broccoli first and drain it thoroughly. Pat it dry before adding it to the casserole to minimize excess moisture. Depending on its texture after thawing, you may not need to blanch it.
Can I make this casserole without Alfredo sauce?
Yes. You can prepare a homemade creamy sauce using butter, milk or cream, garlic, and Parmesan cheese. Make sure the sauce is thick enough to coat the chicken and broccoli before baking.
Is this recipe low-carb?
It can fit into some lower-carbohydrate meal plans because it contains chicken, broccoli, and cheese instead of pasta or rice. However, the carbohydrate content depends on the Alfredo sauce and any optional toppings. Check the nutrition labels if you are following a specific carbohydrate target.
How do I prevent the casserole from becoming watery?
Drain the broccoli well, use a thick Alfredo sauce, and avoid adding extra liquid unless necessary. If using frozen broccoli, thaw and dry it thoroughly before assembling the dish.
Can I prepare it the night before?
Yes. Assemble the casserole, cover it, and refrigerate it for up to 24 hours before baking. Add extra baking time if it goes directly from the refrigerator into the oven, and check that the center is fully heated.
What cheese works best for this recipe?
Mozzarella is ideal for a smooth, stretchy topping. Parmesan adds a savory finish, while cheddar provides a stronger cheese flavor. A combination of mozzarella and cheddar is also delicious.
How can I tell when the casserole is ready?
The sauce should be bubbling around the edges, the cheese should be melted, and the center should be hot throughout. Since the chicken is already cooked, the main goal is to heat the entire casserole thoroughly without drying it out.
Final Thoughts
Cheesy Chicken and Broccoli Casserole is a simple, comforting dinner that combines tender chicken, nutritious broccoli, creamy Alfredo sauce, and a golden layer of melted cheese. With easy preparation and familiar ingredients, it is a practical choice for busy weeknights, family meals, and make-ahead dinners.
Serve it fresh from the oven with a crisp salad or your favorite vegetable side, and enjoy a creamy, satisfying meal that can easily become a regular favorite in your kitchen.