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Creamy Chicken Fettuccine Casserole

Creamy Chicken Fettuccine Casserole is the kind of comforting dinner that turns simple ingredients into something warm, rich, and satisfying. Tender pieces of seasoned chicken are combined with fettuccine, a velvety cream sauce, plenty of melted cheese, and a golden baked topping. Everything comes together in one hearty casserole that is perfect for a family dinner, a cozy weekend meal, or feeding a crowd.

Unlike traditional chicken fettuccine Alfredo, this casserole gets an extra layer of flavor and texture from baking. The sauce coats every strand of pasta, while the cheese melts into the creamy mixture and creates a lightly golden top in the oven.

Why You’ll Love This Recipe

There are plenty of reasons to keep this casserole in your regular dinner rotation:

Comforting and filling: Creamy pasta and tender chicken make a satisfying complete meal.
Family-friendly: The mild, cheesy flavors are easy to enjoy.
Great for leftovers: It reheats well and makes an excellent next-day lunch.
Easy to customize: You can add vegetables, change the cheese, or adjust the seasoning.
Perfect for busy evenings: Several components can be prepared ahead of time.

Ingredients You’ll Need

For the Chicken

2 pounds boneless, skinless chicken breasts or thighs
1 tablespoon olive oil
1 teaspoon Italian seasoning
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
1/2 teaspoon paprika
1/2 teaspoon salt
1/4 teaspoon black pepper

For the Pasta

12 ounces fettuccine
Salt, for the pasta water

For the Creamy Sauce

4 tablespoons unsalted butter
3 cloves garlic, finely minced
3 tablespoons all-purpose flour
3 cups whole milk
1 cup heavy cream
1 cup freshly grated Parmesan cheese
1 cup shredded mozzarella cheese
1/2 teaspoon Italian seasoning
1/4 teaspoon black pepper
Salt, to taste

For the Casserole

1 cup shredded mozzarella cheese
1/4 cup grated Parmesan cheese
2 tablespoons chopped fresh parsley, optional

Step-by-Step Instructions

Step 1: Prepare the Chicken

Begin by preheating your oven to 375°F (190°C).

Pat the chicken dry with paper towels. This helps the seasoning adhere to the surface and encourages better browning during cooking.

In a small bowl, combine the Italian seasoning, garlic powder, onion powder, paprika, salt, and black pepper. Sprinkle the mixture evenly over both sides of the chicken.

Heat the olive oil in a large skillet over medium-high heat. Add the chicken and cook for several minutes on each side until nicely browned and cooked through.

The exact cooking time will depend on the thickness of the chicken. Once cooked, transfer it to a plate and allow it to rest for a few minutes before cutting it into bite-sized pieces.

You can also use leftover cooked chicken or rotisserie chicken to make this recipe even faster.

Step 2: Cook the Fettuccine

Bring a large pot of generously salted water to a boil. Add the fettuccine and cook according to the package directions, but stop about 1–2 minutes before it reaches the recommended cooking time.

The pasta should be slightly firm because it will continue cooking in the oven.

Before draining, reserve about 1 cup of the pasta water. Drain the fettuccine well and set it aside.

Avoid overcooking the pasta at this stage. Soft pasta can become mushy after baking.

Step 3: Make the Creamy Sauce

Return the skillet to medium heat and melt the butter.

Add the minced garlic and cook for about 30 seconds, stirring constantly. You want the garlic to become fragrant without allowing it to brown too much.

Sprinkle the flour over the butter and garlic. Whisk continuously for about 1 minute. This creates a simple roux that will help thicken the sauce.

Gradually pour in the milk while whisking. Add the heavy cream and continue whisking until the mixture becomes smooth.

Allow the sauce to gently simmer for several minutes. Do not let it boil aggressively, as excessive heat can cause a cream sauce to become grainy.

Once the sauce has thickened enough to lightly coat the back of a spoon, reduce the heat to low.

Step 4: Add the Cheese

Stir in the Parmesan cheese and 1 cup of shredded mozzarella.

Add the Italian seasoning and black pepper. Taste the sauce before adding additional salt because Parmesan already contributes quite a bit of saltiness.

Stir until the cheese has completely melted and the sauce is smooth and creamy.

If the sauce seems too thick, add a small splash of the reserved pasta water. The extra starch helps loosen the sauce while keeping it silky.

Step 5: Combine Everything

Place the drained fettuccine into a large mixing bowl or back into the skillet if there is enough room.

Add the chopped chicken and pour the creamy cheese sauce over everything.

Use tongs or a large spoon to gently toss the ingredients together. Make sure the sauce reaches all of the pasta rather than collecting only at the bottom of the bowl.

At this point, the mixture should look generously coated but still slightly loose. The pasta will absorb some of the sauce while baking.