This chicken Alfredo pasta bake has been one of my go-to Sunday dinners ever since I figured out that a proper homemade white sauce takes less than ten minutes and tastes about a hundred times better than anything that comes out of a jar. I still remember the first time I made this for my kids on a cold Tuesday night with leftover rotisserie chicken sitting in the fridge. The whole pan was gone before I even sat down. That told me everything I needed to know.
Growing up on my grandmother’s farm in the Midwest, Sunday dinner always started with butter melting in a heavy pan and Parmesan being grated fresh right at the table. She never once reached for a shortcut, and she taught me that the best pasta dishes start with a real roux. This chicken Alfredo pasta bake carries that same idea forward. Simple ingredients, a sauce built from scratch, broccoli cooked right in the pasta water to save you a pot, and a blanket of melted mozzarella on top that browns just enough at the edges. Whether it is a busy weeknight or a lazy Sunday, your kitchen is going to smell like something worth sitting down for.
Why This Chicken Alfredo Pasta Bake Belongs in Your Recipe Box
After making baked pasta dishes for more years than I care to count, this one checks every box a home cook actually needs. The homemade Alfredo sauce comes together in under ten minutes and clings to every piece of pasta as it bakes, which means no watery bottom, no separated sauce, just creamy, cheesy comfort from edge to edge.
- Homemade Alfredo sauce from scratch with no jarred shortcuts needed
- Uses pantry staples and fridge basics you likely already have on hand
- A smart way to use up leftover rotisserie or roasted chicken
- Ready from start to finish in 40 minutes on a weeknight
- Family-friendly and kid-approved every single time
- Easily made meatless by swapping chicken for mushrooms or cauliflower
- No fancy equipment needed, just a pot, a pan, and a casserole dish
Key Players in This Recipe
Knowing what each ingredient brings to the dish helps you make smart swaps and get consistent results every time.
Pasta (1 lb.): Mezzi Rigatoni is my personal pick because the ridges hold onto the creamy Alfredo sauce beautifully, but penne, ziti, shells, or rotini all work well. I cook it just shy of al dente so it does not get soft in the oven.
Broccoli (3 cups): Broccoli adds color, a little bite, and an earthiness that balances the richness of the cheese sauce. Tossing it into the boiling pasta water for the last three minutes saves a pot and leaves it perfectly tender.
Chicken breasts (2 boneless, skinless): Cooked, diced chicken is the protein anchor here. Leftover rotisserie chicken works great because it is already seasoned and cuts your prep time considerably.
Butter and Flour (1/4 cup each): These two form the roux, which is the base of the bechamel-style Alfredo sauce. Cooking the flour in butter for one to two minutes removes the raw taste and sets you up for a smooth, lump-free sauce.
Whole Milk (4 cups): Whole milk gives the sauce a creamy body without being too heavy. Adding it gradually while whisking is what keeps the texture silky and consistent.
Parmesan Cheese (3/4 cup, freshly grated): Always grate your Parmesan fresh from the block. Pre-shredded Parmesan contains anti-caking agents that make the sauce grainy and prevent it from melting properly.
Mozzarella Cheese (1 1/2 cups, freshly shredded): This goes on top just before baking and creates that golden, bubbly crust. Shredding it yourself from a block makes a real difference in how evenly it melts.
Garlic, Italian Seasoning, Salt and Pepper: Fresh minced garlic gives a brighter flavor than garlic powder. This simple seasoning trio keeps the sauce layered and balanced without overpowering the pasta.
What You Will Need
- Large stockpot for boiling pasta and broccoli
- Large saucepan or skillet for the Alfredo sauce
- 9×13-inch oven-safe casserole dish
- Whisk for a smooth, lump-free sauce
How to Make Chicken Alfredo Pasta Bake
This bake comes together in four stages. Having everything prepped before you start the sauce makes the whole process run smoothly because once the butter hits the pan, things move quickly.
Step 1. Preheat and Prep Preheat your oven to 350 degrees F. If your chicken is not already cooked, cook it now, then dice into bite-sized pieces and place in a large bowl. Leftover rotisserie chicken is the fastest option here.
Step 2. Cook the Pasta and Broccoli Bring a large pot of salted water to a boil and cook your pasta according to package directions. During the last 3 minutes of cook time, add the chopped broccoli right into the same pot. Drain and rinse with cold water to stop the cooking, then add to the bowl with the chicken.
Step 3. Build the Roux Place a large saucepan over medium heat and melt the butter. Whisk in the flour and stir constantly for 1 to 2 minutes. Do not rush this step. Cooking out the flour is what prevents a raw, pasty taste in the finished sauce.
Step 4. Make the Alfredo Sauce Pour in the milk slowly in increments, whisking continuously between each addition until smooth. Once all the milk is incorporated, stir in the freshly grated Parmesan, minced garlic, salt, pepper, and Italian seasoning. Simmer for 2 to 3 minutes, stirring occasionally. The sauce will look thin at this stage. That is completely normal. It thickens as it bakes.
Step 5. Assemble Pour the Alfredo sauce over the pasta, broccoli, and chicken in your casserole dish. Stir everything together until the pasta is evenly coated.
Step 6. Top and Bake Scatter the freshly shredded mozzarella evenly across the top. Bake at 350 degrees F for 20 to 25 minutes, or until the cheese is melted and just beginning to turn golden at the edges.
Step 7. Rest and Serve Remove from the oven and let the bake rest for 5 minutes before serving. A sprinkle of fresh parsley or a pinch of red pepper flakes on top finishes it nicely.
Important Notes
Parmesan cheese: Grate it fresh from the block every time. Pre-packaged shredded Parmesan contains anti-caking agents that create a grainy texture and prevent the sauce from coming together smoothly.
Mozzarella cheese: Freshly shredded mozzarella melts more evenly and creates a better crust than bags of pre-shredded cheese.
Sauce consistency: The sauce is meant to look thin before it goes in the oven. It thickens during baking and continues to set as it cools after you pull it out.
Chicken: Any cooked chicken works here, rotisserie, roasted, grilled, or poached. Use whatever you have.
Betty’s Tips for Best Results
- Pre-cook and dice the chicken a day ahead to cut active prep time down to under 10 minutes on the night you make it
- Boil the broccoli right in the pasta pot during the last 3 minutes to save time and reduce cleanup
- For a meatless version, skip the chicken and add sliced mushrooms, cauliflower florets, or roasted zucchini
- Any short pasta works here including penne, ziti, shells, rotini, farfalle, or fusilli
- For extra richness, substitute 1 cup of the whole milk with heavy cream
- When reheating leftovers, add a splash of whole milk or chicken broth to loosen the sauce and warm it on the stovetop for the best texture
What to Serve With Chicken Alfredo Pasta Bake
This bake is rich and creamy, so the best sides are bright, light, and refreshing.
- A classic Caesar salad pairs beautifully here because the crisp romaine and tangy dressing cut right through the richness of the cheese sauce. Try this Chicken Caesar Pasta Salad: https://nonnafood.com/chicken-caesar-pasta-salad/ if you want to keep it pasta-themed.
- Crusty garlic bread is the obvious choice for soaking up the sauce. Betty’s Perfect Parmesan Garlic Bread: https://nonnafood.com/perfect-parmesan-garlic-bread-recipe/ is a natural match.
- A simple green salad with lemon vinaigrette keeps things fresh alongside the cheesy bake.
- Roasted asparagus or green beans add color and nutrition without competing with the main dish. These Honey Glazed Carrots and Green Beans: https://nonnafood.com/easy-honey-glazed-carrots-green-beans/ are a crowd favorite on the side.
- If you love baked pasta dishes, this Creamy Pesto Chicken Pasta Bake: https://nonnafood.com/creamy-pesto-chicken-pasta-bake-easy-high-protein-dinner/ is another weeknight winner worth bookmarking.
- For a lighter chicken pasta option, this Creamy Rotisserie Chicken Broccoli Pasta: https://nonnafood.com/creamy-rotisserie-chicken-broccoli-pasta-recipe/ uses similar ingredients in a stovetop format.
Keeping This Bake Fresh
Refrigerator: Let the bake cool completely before transferring leftovers to an airtight container. It keeps well in the fridge for up to 4 days. I usually portion it into individual containers so weekday lunches are ready to grab quickly.
Freezing: This bake is not ideal for freezing. The milk-based Alfredo sauce can separate and become grainy once thawed. If you want to meal prep, prepare the components separately and assemble fresh before baking.
Reheating: The stovetop gives the best results. Reheat over medium-low heat with a splash of whole milk or chicken broth, stirring gently until warmed through. The microwave works in a pinch but add a little liquid first and cover loosely so the pasta does not dry out.
FAQs
You can, but the flavor difference is significant. Homemade sauce takes under 10 minutes and gives you a rich, velvety coating that clings to every piece of pasta. Jarred sauce tends to be thinner and saltier.
That is by design. The sauce thickens as it heats in the oven and continues to set as the bake cools after coming out. If it still seems loose after baking, try reducing the milk by 1/2 cup next time or simmer the sauce a few extra minutes before assembling.
Yes. Cook the pasta and broccoli, dice the chicken, and prepare the Alfredo sauce up to one day ahead. Store each component separately in the fridge, then assemble and bake when ready. Add 5 to 10 extra minutes to the bake time if going in cold from the refrigerator.
Chicken Alfredo Pasta Bake with Broccoli
Equipment
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Large stockpot
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Large saucepan or skillet
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9×13-inch oven-safe casserole dish
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whisk
Ingredients
Instructions
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Preheat oven to 350 degrees F.
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Cook the chicken if not already cooked and dice into bite-sized pieces. Place in a large bowl.
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Bring a large pot of salted water to a boil and cook pasta according to package directions. During the last 3 minutes, add the broccoli into the same pot. Drain and rinse with cold water to stop the cooking. Add to the bowl with the chicken.
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Place a large saucepan over medium heat and melt the butter. Whisk in the flour and cook the roux for 1 to 2 minutes, stirring constantly.
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Slowly whisk in the milk in increments until fully incorporated. Add the Parmesan cheese, garlic, salt, pepper, and Italian seasoning. Simmer for 2 to 3 minutes, stirring occasionally. The sauce will appear thin but thickens during baking.
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Pour the sauce over the pasta, broccoli, and chicken in your casserole dish. Stir until the pasta is evenly coated.
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Top with the freshly shredded mozzarella and bake for 20 to 25 minutes, or until the cheese is melted and just beginning to turn golden.
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Remove from oven and rest for 5 minutes. Garnish with fresh parsley or red pepper flakes if desired. Serve warm.
Notes
The post Chicken Alfredo Pasta Bake with Broccoli appeared first on NonnaFood.
