Creamy Baked Chicken Alfredo Casserole
This baked chicken alfredo casserole takes everything you love about the classic pasta and turns it into a no-fuss weeknight dinner.
A creamy, garlicky sauce, tender chicken, and a golden, bubbly cheese topping come together in one dish with very little hands-on effort.
Why This Casserole Works
The sauce stays smooth even after baking because it’s thickened with a little flour and cream cheese, not just cream. That small tweak keeps it from breaking or turning oily.
Using penne gives the casserole good structure, and a quick broil at the end melts the mozzarella into a lightly crisp, golden topping that everyone fights over.
It’s the kind of dinner that feels a little special but uses mostly staples you already have. I keep coming back to it on nights when I want comfort without a lot of cleanup.
Ingredients
- 1 lb boneless, skinless chicken breasts, cut into 1-inch pieces: thighs work too, just cook them a minute longer
- 12 oz penne pasta: ziti or rigatoni are great swaps
- 2 tbsp olive oil: for searing the chicken
- 1 tsp salt, divided: half for the chicken, half for the sauce
- ½ tsp black pepper
- 3 tbsp unsalted butter: the base of the alfredo
- 3 cloves garlic, minced: fresh is best here
- 2 tbsp all-purpose flour: thickens the sauce without heaviness
- 2 cups heavy cream: room temperature helps it blend smoothly
- 4 oz cream cheese, softened, cut into cubes: the secret to a sauce that stays creamy in the oven
- 1¼ cups freshly grated Parmesan cheese: divided; pre-shredded won’t melt as well
- 1½ cups shredded low-moisture mozzarella: for that pull-apart topping
Variations / Substitutions
- Protein: Cooked shrimp or leftover shredded turkey both work. Stir them in when you toss the pasta, no searing needed.
- Make it veggie-packed: Fold in 2 cups of steamed broccoli florets or thawed frozen peas before baking.
- Dairy-free: Use plant-based butter, cream, cream cheese, and shredded cheese alternatives. The sauce will be a little thinner, so let it bubble a bit longer on the stove.
- Rotisserie shortcut: Skip the sear step entirely and stir 3 cups of shredded cooked chicken into the sauce.
If you like this one, you might want to try my Baked Ziti with Sausage.
How to Make Creamy Baked Chicken Alfredo Casserole
Step 1: Boil the Pasta
Bring a large pot of salted water to a boil and cook the 12 oz penne until just shy of al dente, about 2 minutes less than the package directions say. Drain it well and set aside.
The pasta will finish cooking in the oven, so it should still have a firm bite when you drain it. If it’s already tender, it can turn mushy later.
Step 2: Sear the Chicken
Heat the 2 tbsp olive oil in a large oven-safe skillet over medium-high heat. Season the chicken pieces with ½ tsp salt and the ½ tsp pepper, then sear them in a single layer for about 5 to 6 minutes total, turning once, until the outside is golden brown and the juices run clear.
The pieces should have a light crust and feel firm to the touch. Transfer them to a plate and keep the pan handy for the sauce.
Step 3: Cook the Alfredo Sauce
Lower the heat to medium and melt the 3 tbsp butter in the same skillet. Add the 3 cloves minced garlic and cook for 30 seconds until fragrant, then whisk in the 2 tbsp flour and let it bubble for 1 minute. Slowly pour in the 2 cups heavy cream while whisking, then add the 4 oz cream cheese cubes and stir until everything is smooth and no lumps remain.
Continue stirring for 3 to 4 minutes until the sauce thickens enough to coat the back of a spoon. Off the heat, stir in 1 cup of the Parmesan and the remaining ½ tsp salt, and taste for seasoning. The sauce will look loose at this stage, which is exactly what you want before baking.
Step 4: Toss Together the Casserole
Add the drained pasta and the seared chicken to the sauce and fold everything together until each piece is well coated. Pour the mixture into a 9×13-inch baking dish if your skillet isn’t oven-safe, or leave it right in the oven-safe skillet if you used one.
The mixture should look a little saucy and will settle into an even layer as you spread it. Scrape every bit of sauce from the pan, it’s the best part.
Step 5: Bake and Broil the Casserole
Scatter the remaining ¼ cup Parmesan and all 1½ cups shredded mozzarella over the top. Bake at 375°F (190°C) for 20 to 25 minutes, until the edges are bubbling and the cheese has melted. Switch the oven to broil and watch closely for 2 to 3 minutes until the top turns spotty and golden.
Pull it out and let the casserole rest for 5 minutes. Scoop into warm bowls and serve while the cheese is still stretchy and the sauce is creamy.
Tips for the Best Baked Alfredo
- Grate the Parmesan yourself. Pre-shredded cheese often contains anti-caking agents that can make the sauce grainy instead of silky.
- If the sauce seems too thick after you add the cheese, splash in a little reserved pasta water or extra cream to loosen it before baking.
- An oven-safe skillet cuts down on dishes and keeps all the flavor in one pan. Just make sure the handle is heatproof.
- Leftover broiled cheese can harden as it cools. To revive it after storing, add a thin drizzle of milk or cream before reheating.
Bake times for different dish sizes:
| Dish Size | Bake Time |
|---|---|
| 9×13-inch | 20 to 25 minutes |
| 8×8-inch | 25 to 30 minutes |
| 2-quart oval | 25 to 30 minutes |
Storing Leftover Casserole
- Refrigerate: Transfer to an airtight container and keep for up to 4 days.
- Reheating: Warm individual portions in the microwave with a splash of milk to loosen the sauce. For larger amounts, cover with foil and reheat at 325°F (165°C) for 15 minutes.
- Freezing: Freeze the baked casserole (cooled first) tightly wrapped for up to 2 months. Thaw overnight in the fridge before reheating.
What to Serve With Chicken Alfredo Casserole
A simple arugula salad with lemon vinaigrette cuts through the richness and keeps the plate feeling fresh. Steamed or roasted broccoli adds a little bite and soaks up any extra sauce. If you want something bready, garlic knots or a crusty baguette are nice for scooping, but a green vegetable is all you really need.
Frequently Asked Questions
Can I use jarred alfredo sauce?
Yes, you can skip the sauce steps entirely. Use 2 cups of your favorite store-bought alfredo, warm it gently, then toss with the pasta and chicken before baking.
Can I make this casserole ahead of time?
Assemble the whole dish (without baking), cover it tightly, and refrigerate overnight. When you are ready, bake it straight from the fridge and add about 10 extra minutes to the bake time.
Can I freeze the unbaked casserole?
You can, but the sauce may separate slightly after thawing. For best results, bake it first, then freeze individual portions.
Which pasta shapes work best?
Medium shapes with ridges or tubes hold the sauce well. Penne, ziti, rigatoni, or even cavatappi are good choices. Avoid long noodles like fettuccine, they make serving messy.
Chicken Alfredo Casserole Recipe
Ingredients
Method
- Boil penne in salted water until just shy of al dente, about 2 minutes less than package directions, then drain well.
- Heat oil in a large skillet over medium-high. Season chicken with ½ tsp salt and pepper, sear 5 to 6 minutes until golden and cooked through, then set aside.
- Lower heat to medium, melt butter, and cook garlic 30 seconds. Whisk in flour for 1 minute, then slowly add cream. Stir in cream cheese until smooth, about 3 to 4 minutes. Off heat, mix in 1 cup Parmesan and remaining ½ tsp salt.
- Fold pasta and chicken into the sauce, then transfer to a 9×13-inch baking dish (or keep in an oven-safe skillet).
- Top with remaining ¼ cup Parmesan and all mozzarella. Bake at 375°F (190°C) for 20 to 25 minutes until bubbly, then broil 2 to 3 minutes for a golden top. Rest 5 minutes, then serve.
