Cheesy Baked Chicken and Broccoli Alfredo Pasta: A Make-Ahead Casserole for Busy Nights

When you want the comfort of chicken Alfredo but with the convenience of a casserole, Cheesy Baked Chicken and Broccoli Alfredo Pasta is the answer. Tender chunks of chicken, bright broccoli florets, and penne pasta are folded into a creamy homemade Alfredo sauce, then topped with a blanket of mozzarella and a sprinkle of Parmesan and baked until golden and bubbling. It’s rich, cheesy, and hearty, and it can be assembled ahead of time so dinner is ready when you are.

Baking transforms a familiar stovetop dish into something even more satisfying. The edges of the pasta crisp slightly, the cheese on top forms a golden, stretchy crust, and the sauce thickens into a creamy blanket that holds everything together. Because the recipe feeds a crowd and reheats well, it’s a natural fit for family dinners, potlucks, and meal prepping.

In this guide, you’ll find a note on the ingredients, the key to a sauce that doesn’t dry out in the oven, a step-by-step method, make-ahead instructions, troubleshooting tips, variations, storage and reheating advice, and answers to frequently asked questions.

Why This Recipe Works

Alfredo made from scratch is thick enough to bake. A homemade Alfredo sauce, made with butter, garlic, cream, and Parmesan, has enough body to coat the pasta while staying creamy through the baking time.

Slightly undercooked pasta finishes in the oven. Pulling the pasta from the water a couple of minutes early lets it absorb some sauce as it bakes, so it ends up tender rather than mushy.

Broccoli adds freshness and color. Briefly blanched florets keep their bright green color and a pleasant bite, giving the dish balance against all that cream and cheese.

The two-cheese topping provides contrast. Mozzarella melts into a golden, stretchy layer, while Parmesan adds salty crunch on top.

It works well as a make-ahead meal. You can assemble the whole dish a day in advance and bake it when needed, making it ideal for busy schedules.

Ingredients You’ll Need

A note on ingredients: since no ingredient list was provided, the version below is a classic, well-balanced build for this dish. Feel free to adjust amounts and seasonings to your taste.

For the Pasta and Vegetables

• 12 oz penne pasta — sturdy tubes that hold sauce and bake well
• 3 cups broccoli florets, cut into bite-size pieces — adds color, texture, and nutrition

For the Chicken

• 1½ lbs boneless, skinless chicken breasts, cut into bite-size pieces — the protein base
• 1 tsp garlic powder — adds savory flavor
• 1 tsp Italian seasoning — adds gentle herbal notes
• ½ tsp paprika — adds warmth and color
• ¾ tsp salt — seasons the chicken
• ½ tsp black pepper — adds mild heat
• 1 tbsp olive oil — for searing

For the Alfredo Sauce

• 4 tbsp unsalted butter — the rich base of the sauce
• 4 cloves garlic, minced — the aromatic heart of the sauce
• 2 tbsp all-purpose flour — helps the sauce stay thick and stable in the oven
• 2 cups heavy cream — creates the creamy base
• 1 cup whole milk — loosens the sauce slightly so the pasta doesn’t dry out
• 1½ cups freshly grated Parmesan cheese, divided — adds salty, nutty depth; reserve ¼ cup for the topping
• ¼ tsp ground nutmeg (optional) — a classic accent for cream sauces
• Salt and black pepper to taste — final seasoning

For the Topping

• 2 cups shredded mozzarella cheese — melts into a golden, stretchy layer
• ¼ cup grated Parmesan (from the total above) — adds a salty finish
• 2 tbsp chopped fresh parsley (optional) — for garnish

Step-by-Step Instructions

Step 1: Preheat and Prepare

Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with butter or nonstick spray.

Step 2: Cook the Pasta and Broccoli

Bring a large pot of well-salted water to a boil. Add the penne and cook for 2 minutes less than the package directions, so it’s still quite firm; it will finish cooking in the oven. In the final 2 minutes of cooking, add the broccoli florets to the same pot. Drain the pasta and broccoli together and set aside.

Step 3: Season and Sear the Chicken

Pat the chicken dry with paper towels. In a bowl, toss it with the garlic powder, Italian seasoning, paprika, salt, and pepper. Heat the olive oil in a large, deep skillet over medium-high heat. Add the chicken in a single layer, working in batches if necessary, and cook for 5 to 7 minutes, until golden and cooked through to 165°F (74°C). Transfer the chicken to a plate.

Step 4: Start the Alfredo Sauce

Reduce the heat to medium and add the butter to the same skillet. When melted, add the garlic and cook for 45 to 60 seconds, stirring constantly, until fragrant. Sprinkle in the flour and whisk for 1 minute to cook off the raw flour taste.

Step 5: Add the Cream and Milk

Slowly pour in the milk while whisking to prevent lumps, then add the cream. Bring the mixture to a gentle simmer over medium-low heat and cook for 3 to 4 minutes, whisking often, until slightly thickened and able to coat the back of a spoon.

Step 6: Melt in the Parmesan

Reduce the heat to low and add 1¼ cups of the Parmesan a handful at a time, whisking until each addition melts before adding more. Stir in the nutmeg if using, and season with salt and pepper. The sauce should be creamy and slightly looser than you want the final dish to be, since the pasta will absorb some while baking.

Step 7: Combine Everything

Fold the drained pasta, broccoli, and seared chicken into the Alfredo sauce, stirring gently until everything is coated. Transfer the mixture to the prepared baking dish and spread it into an even layer.

Step 8: Add the Topping

Sprinkle the mozzarella evenly over the pasta, followed by the remaining ¼ cup of Parmesan.

Step 9: Bake

Bake, uncovered, for 18 to 22 minutes, until the sauce is bubbling around the edges and the cheese is melted and lightly golden. For extra browning, broil for the final 1 to 2 minutes, watching closely to prevent burning.

Step 10: Rest and Serve

Let the casserole rest for 5 to 10 minutes before serving, so the sauce can settle and thicken slightly. Garnish with parsley and serve hot.

Make-Ahead Instructions

Assemble ahead: Follow the recipe through Step 7, then transfer the mixture to the baking dish, cover tightly, and refrigerate for up to 24 hours. Add the cheese topping just before baking.

Bake from cold: Allow the casserole to sit at room temperature for 20 to 30 minutes, then bake covered with foil for 20 minutes, uncovered for another 15 to 20 minutes, until hot throughout and golden on top.

Prep components separately: You can cook and season the chicken, blanch the broccoli, and make the sauce a day ahead and store them separately, combining them just before baking.

Troubleshooting Guide

The casserole is dry. The sauce may have been too thick, or the pasta overcooked before baking. Keep the sauce slightly loose, undercook the pasta, and consider adding a splash of milk before baking.

The sauce separated. The cream was likely heated too aggressively or the cheese was added too quickly. Keep the heat low and add the Parmesan gradually.

The sauce is grainy. Pre-grated cheese, which often contains anti-caking starch, is a common culprit. Use freshly grated Parmesan for the smoothest sauce.

The broccoli is mushy. It was probably blanched too long. Two minutes in the pasta water is plenty, since it cooks further in the oven.

The top isn’t browning. Broil for a minute or two at the end, and make sure the cheese is spread evenly.

The casserole is soupy. It may not have rested long enough, or the sauce had too much liquid. Let it stand for 10 minutes, which thickens it noticeably.

Variations to Try

Add garlic bread crumbs. Toss panko with melted butter, garlic powder, and Parmesan, then sprinkle over the cheese before baking for a crunchy topping.

Add spinach. Stir in a few handfuls of fresh baby spinach when you combine the ingredients.

Make it spicy. Add red pepper flakes to the sauce for a gentle kick.

Use rotisserie chicken. Shred about 3 cups of rotisserie chicken and skip the searing step for a faster dinner.

Swap the cheese. Provolone, fontina, or white cheddar can replace some or all of the mozzarella.

Add bacon. Fold crumbled crispy bacon into the pasta for a smoky, salty note.

Make it lighter. Replace some of the cream with additional milk, and use a reduced-fat mozzarella. The sauce will be less rich but still creamy.

What to Serve With It

• A crisp salad with a tangy vinaigrette cuts the richness
• Garlic bread is a natural companion
• Roasted tomatoes or green beans add brightness and color
• A glass of white wine, such as Chardonnay or Pinot Grigio, pairs well with the creamy sauce

Storage and Reheating

Refrigerator: Cover and store leftovers for up to 4 days. The pasta will absorb more sauce as it sits.

Freezer: Freeze baked or unbaked portions in airtight containers for up to 2 months. Thaw overnight in the refrigerator before reheating. The sauce may be slightly less smooth after freezing but will still taste good.

Oven reheating: Cover with foil and warm at 350°F (175°C) for 20 to 25 minutes, adding a splash of milk if it looks dry. Remove the foil for the last 5 minutes to re-crisp the top.

Microwave reheating: Add a spoonful of milk, cover loosely, and heat in 30-second increments, stirring between each.

Frequently Asked Questions

Can I use jarred Alfredo sauce? You can, using about 3 cups. Homemade tastes richer and is easy to make, but jarred sauce works in a pinch.

Do I need to include the flour? The flour helps the sauce stay thick and stable in the oven, especially when it will be reheated or made ahead. You can omit it for a more traditional Alfredo, though the sauce may be a little looser or more prone to separating.

What other pasta can I use? Rigatoni, rotini, fusilli, shells, or ziti all work well. Choose a sturdy shape that can handle baking.

Can I use frozen broccoli? Yes. Thaw and drain it well, then fold it into the pasta without blanching.

Can I use chicken thighs instead of breasts? Yes, boneless thighs are juicier and more forgiving. Cook them to 165°F (74°C).

Can I make this gluten-free? Yes, using gluten-free pasta and a gluten-free flour blend or cornstarch in place of the flour. Check seasoning labels as well.

How many servings does this make? About 6 to 8 servings, depending on portion size.

Final Thoughts

Cheesy Baked Chicken and Broccoli Alfredo Pasta takes the creamy appeal of a classic Alfredo and turns it into a reliable, make-ahead family dinner. With juicy chicken, tender broccoli, a silky homemade sauce, and a golden cheese crust, it offers comfort and convenience in one dish.

Whether you’re feeding a busy household, bringing a dish to a gathering, or stocking the fridge for the week, this casserole delivers every time. Save it, bookmark it, or print it out, because it’s the kind of recipe that earns a permanent place in your dinner rotation.