Chicken Broccoli Alfredo Casserole – Creamy, Cozy, and Weeknight-Friendly
This is the kind of dinner that brings everyone to the table without a fuss. Tender chicken, fresh broccoli, and pasta get tucked into a silky Alfredo sauce, then baked until bubbly and golden. It tastes like classic comfort food, but it’s simple enough for a busy weeknight.
The best part? It reheats beautifully, so leftovers are a win. If you love creamy pasta and crave something easy and satisfying, this casserole belongs in your rotation.
Ingredients
Method
- Preheat and prep: Heat the oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish. Bring a large pot of salted water to a boil.
- Cook the pasta: Boil pasta until just shy of al dente, about 1–2 minutes less than package directions. During the last 2 minutes, add the broccoli florets to blanch. Drain well.
- Start the sauce: In a large skillet or pot, melt butter over medium heat. Add garlic and cook 30–60 seconds until fragrant.
- Build the roux: Sprinkle in flour, whisk, and cook 1–2 minutes until the mixture looks slightly golden. This keeps the sauce smooth.
- Add liquids: Slowly whisk in chicken broth, then cream. Simmer gently, whisking, until thick enough to coat a spoon, 3–5 minutes. Don’t boil hard.
- Season and cheese it: Stir in Parmesan, Italian seasoning, onion powder, nutmeg (if using), and a good pinch of salt and pepper. Taste and adjust. The sauce should be well-seasoned.
- Combine: In a large bowl, mix pasta, broccoli, chicken, and the Alfredo sauce until everything is evenly coated.
- Assemble: Spread the mixture in the baking dish. Top with mozzarella. For crunch, toss bread crumbs with a drizzle of olive oil and sprinkle over the cheese.
- Bake: Bake 18–22 minutes, until bubbly around the edges and lightly golden on top. Broil 1–2 minutes at the end if you want extra color.
- Rest and serve: Let it sit 5–10 minutes to set. Garnish with parsley and serve warm.
What Makes This Recipe So Good
- Comforting and familiar: Creamy Alfredo, juicy chicken, and broccoli are a timeless trio that hits the spot.
- Weeknight simple: Uses everyday ingredients, minimal prep, and one baking dish.
- Balanced: Protein, veggies, and carbs in one pan—no need for a bunch of sides.
- Make-ahead friendly: Assemble earlier in the day, then bake when you’re ready.
- Flexible: Swap pasta shapes, add extra veggies, or use a shortcut sauce if you need speed.
Shopping List
- Chicken: 2 cups cooked chicken breast or thigh, shredded or cubed
- Broccoli: 4 cups small florets (fresh or frozen, thawed)
- Pasta: 12 ounces short pasta (penne, rotini, or ziti)
- Butter: 4 tablespoons (half a stick)
- Garlic: 3–4 cloves, minced
- All-purpose flour: 3 tablespoons
- Chicken broth: 1 cup, low-sodium
- Heavy cream: 1 1/2 cups (or half-and-half for lighter)
- Parmesan cheese: 1 1/4 cups, freshly grated
- Mozzarella cheese:
- Olive oil: 1 tablespoon (for greasing and sautéing, if needed)
- Seasonings: 1 teaspoon Italian seasoning, 1/2 teaspoon onion powder, 1/4 teaspoon nutmeg (optional), salt, and pepper
- Fresh parsley: A small handful, chopped (optional garnish)
- Bread crumbs or panko: 1/2 cup (optional crunchy topping)
How to Make It
- Preheat and prep: Heat the oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish. Bring a large pot of salted water to a boil.
- Cook the pasta: Boil pasta until just shy of al dente, about 1–2 minutes less than package directions. During the last 2 minutes, add the broccoli florets to blanch.
Drain well.
- Start the sauce: In a large skillet or pot, melt butter over medium heat. Add garlic and cook 30–60 seconds until fragrant.
- Build the roux: Sprinkle in flour, whisk, and cook 1–2 minutes until the mixture looks slightly golden. This keeps the sauce smooth.
- Add liquids: Slowly whisk in chicken broth, then cream.
Simmer gently, whisking, until thick enough to coat a spoon, 3–5 minutes. Don’t boil hard.
- Season and cheese it: Stir in Parmesan, Italian seasoning, onion powder, nutmeg (if using), and a good pinch of salt and pepper. Taste and adjust.
The sauce should be well-seasoned.
- Combine: In a large bowl, mix pasta, broccoli, chicken, and the Alfredo sauce until everything is evenly coated.
- Assemble: Spread the mixture in the baking dish. Top with mozzarella. For crunch, toss bread crumbs with a drizzle of olive oil and sprinkle over the cheese.
- Bake: Bake 18–22 minutes, until bubbly around the edges and lightly golden on top.
Broil 1–2 minutes at the end if you want extra color.
- Rest and serve: Let it sit 5–10 minutes to set. Garnish with parsley and serve warm.
Keeping It Fresh
- Storage: Cool completely, then cover and refrigerate for up to 4 days.
- Reheating: Reheat covered at 325°F (165°C) for 15–20 minutes, or microwave in short bursts with a splash of milk to keep it creamy.
- Freezing: Assemble without baking, wrap tightly, and freeze up to 2 months. Thaw overnight, then bake as directed, adding 5–10 extra minutes if cold.
- Make-ahead: Build the casserole earlier in the day, refrigerate, and bake before dinner.
Add an extra 5–10 minutes to the bake if it’s going in cold.
Benefits of This Recipe
- Family-friendly: Mild flavors, creamy texture, and familiar ingredients please picky eaters.
- Efficient: Uses one sauce pan, one pot, and one baking dish for easy cleanup.
- Budget-conscious: Pantry staples and a little cheese go a long way.
- High-protein and veggie-forward: Chicken and broccoli make it satisfying without feeling heavy.
- Adaptable: Works with rotisserie chicken or leftover grilled chicken to save time.
Pitfalls to Watch Out For
- Soggy pasta: Undercook the pasta slightly before baking. Overcooked pasta will turn mushy in the oven.
- Bland sauce: Season at every step. Salt the pasta water, taste the sauce, and add pepper and Parmesan until it pops.
- Broken sauce: Don’t boil the cream.
Keep the heat gentle to avoid curdling or separation.
- Watery casserole: Drain broccoli well. Excess water thins the sauce.
- Greasy top: Use freshly grated Parmesan and moderate mozzarella. Pre-shredded blends can be oily.
Variations You Can Try
- Lighter swap: Use half-and-half and reduce mozzarella by half.
Add extra broccoli or some spinach for volume.
- Protein twist: Try cooked turkey, Italian sausage, or shrimp. For shrimp, add it raw and bake just until pink.
- Extra veggies: Stir in sautéed mushrooms, peas, or roasted red peppers for color and sweetness.
- Gluten-free: Use gluten-free pasta and a 1:1 gluten-free flour in the roux.
- Low-carb: Swap pasta with steamed cauliflower florets or spaghetti squash strands. Thicken the sauce a bit more to compensate.
- Pesto Alfredo: Stir 2–3 tablespoons of basil pesto into the sauce for a fresh, herby kick.
- Spicy spin: Add red pepper flakes to the sauce and use a sharp provolone or pepper jack on top.
FAQ
Can I use jarred Alfredo sauce?
Yes.
Use about 3 to 3 1/2 cups of a good-quality Alfredo sauce. Warm it with a splash of broth or milk so it coats evenly, and taste it—jarred sauces may need extra Parmesan or pepper.
Do I have to cook the chicken first?
Pre-cooked chicken is the safest and fastest route. If you only have raw chicken, dice it small, season it, and sauté until cooked through before assembling the casserole.
What pasta shape works best?
Short, ridged pasta like penne, rotini, or rigatoni grips the sauce well and holds up during baking.
Avoid very thin pasta, which can overcook quickly.
Can I use frozen broccoli?
Yes. Thaw and pat it dry, or add it frozen and extend the bake time slightly. If it releases water, let the casserole rest longer to set.
How can I make it extra creamy?
Use heavy cream, add an extra 1/4 cup Parmesan, and whisk in a tablespoon of cream cheese to the sauce for extra body and silkiness.
What can I serve with it?
A simple green salad with lemony vinaigrette and some garlic bread or a warm baguette balances the richness perfectly.
How do I keep the top from drying out?
Cover loosely with foil for the first 10 minutes, then uncover to brown.
Also, don’t skimp on sauce—everything should be well coated before baking.
Final Thoughts
Chicken Broccoli Alfredo Casserole delivers big comfort with simple steps and familiar flavors. It’s creamy, hearty, and easy to tailor to your taste or whatever’s in your fridge. Make it on a weeknight, prep it for guests, or stash one in the freezer for busy days.
Either way, it’s the kind of cozy, crowd-pleasing dinner you’ll make again and again.
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