Chicken Spaghetti Casserole

This Chicken Spaghetti Casserole is creamy, cheesy, comforting, and packed with tender chicken and flavorful pasta. It’s the kind of cozy dinner that brings everyone to the table and makes an ordinary weeknight feel a little more special.

If you’re looking for an easy cheesy chicken spaghetti that’s satisfying without being complicated, this recipe is a great one to keep in your dinner rotation. The combination of tender chicken, spaghetti, creamy tomato sauce, and melted cheese creates a hearty casserole with plenty of comforting flavor in every bite.

It’s also a flexible recipe that works beautifully with rotisserie chicken or leftover cooked chicken, making it especially convenient when you need dinner without starting everything from scratch. And if you prefer chicken spaghetti without Velveeta, this version gets its rich, creamy texture from a combination of cheeses and simple ingredients.

Why You’ll Love This Chicken Spaghetti Casserole

• Creamy and cheesy: Cream cheese, sour cream, cheddar, and mozzarella create a smooth, flavorful sauce.
• Comfort food favorite: It’s hearty enough for dinner and cozy enough for a weekend meal.
• Great for busy nights: Cooked chicken and a handful of pantry staples make preparation straightforward.
• No Velveeta required: You get a creamy casserole using everyday cheeses.
• Family-friendly: The mild tomato and cheese sauce pairs beautifully with tender chicken and pasta.
• Perfect for leftovers: The flavors settle beautifully, making leftovers ideal for lunch the next day.
• Make-ahead friendly: Assemble the casserole ahead of time and bake when you’re ready.

Ingredients You’ll Need

For the Chicken Spaghetti

• 12 ounces spaghetti
• 3 cups cooked shredded chicken
• 1 tablespoon olive oil or butter
• 1 small yellow onion, finely diced
• 3 cloves garlic, minced
• 1 can (14.5 ounces) diced tomatoes, lightly drained
• 1 cup tomato sauce
• 1 cup chicken broth
• 4 ounces cream cheese, softened
• 1/2 cup sour cream
• 1 teaspoon Italian seasoning
• 1/2 teaspoon smoked paprika
• 1/2 teaspoon garlic powder
• 1/2 teaspoon salt, or to taste
• 1/4 teaspoon black pepper
• 1/4 teaspoon red pepper flakes, optional
• 1 cup shredded sharp cheddar cheese
• 1/2 cup shredded mozzarella cheese

For the Topping

• 1 cup shredded mozzarella or cheddar-mozzarella blend
• 2 tablespoons grated Parmesan cheese
• 1 tablespoon chopped fresh parsley, for serving

How to Make Chicken Spaghetti Casserole

1. Prepare the oven and baking dish

Preheat your oven to 350°F (175°C).

Lightly grease a 9×13-inch baking dish and set it aside.

2. Cook the spaghetti

Bring a large pot of salted water to a boil. Break the spaghetti in half if you prefer shorter pieces, then cook according to the package directions until just shy of al dente.

Don’t cook the pasta until completely soft. It will continue cooking in the oven, and slightly undercooked spaghetti helps prevent the finished casserole from becoming mushy.

Drain the spaghetti and set it aside.

3. Sauté the onion and garlic

Heat the olive oil or butter in a large skillet over medium heat.

Add the diced onion and cook for about 3–4 minutes, until softened and translucent. Stir in the minced garlic and cook for another 30 seconds, just until fragrant.

4. Build the creamy tomato sauce

Add the diced tomatoes, tomato sauce, and chicken broth to the skillet.

Stir in the Italian seasoning, smoked paprika, garlic powder, salt, black pepper, and red pepper flakes if using.

Reduce the heat to medium-low and let the mixture simmer for about 3–4 minutes.

Add the softened cream cheese and stir until completely melted into the sauce.

Remove the skillet from the heat and stir in the sour cream.

The sauce should be creamy, smooth, and loose enough to coat the spaghetti generously.

5. Add the chicken and cheese

Add the shredded chicken to the sauce and stir to combine.

Mix in 1 cup of shredded cheddar and 1/2 cup of mozzarella. Stir until the cheese begins to melt into the warm sauce.

This is where the casserole gets its rich, cheesy character without needing processed cheese.

6. Combine with the spaghetti

Add the cooked spaghetti to the skillet.

Gently toss everything together until the noodles are evenly coated with the creamy chicken sauce.

If the mixture seems unusually thick, add a small splash of chicken broth to loosen it.

7. Assemble the casserole

Transfer the chicken spaghetti mixture to the prepared 9×13-inch baking dish.

Spread it into an even layer.

Sprinkle the remaining mozzarella or cheese blend over the top, followed by the Parmesan.

8. Bake until bubbly

Cover the baking dish loosely with aluminum foil and bake for 20 minutes.

Remove the foil and continue baking for another 10–15 minutes, or until the cheese is melted, bubbling, and lightly golden around the edges.

For an extra golden top, you can place the casserole under the broiler for 1–2 minutes at the end. Watch it carefully because the cheese can brown quickly.

9. Rest and serve

Remove the casserole from the oven and let it rest for about 5–10 minutes.

Sprinkle with fresh parsley, then scoop and serve while warm.

Tips for the Best Chicken Spaghetti

Don’t overcook the pasta

This is one of the most important details. Cook the spaghetti until just shy of al dente because it continues cooking as the casserole bakes.

Use flavorful chicken

Rotisserie chicken is a convenient choice, but leftover roasted chicken or poached chicken works just as well. Make sure the chicken is shredded into bite-sized pieces so it distributes evenly throughout the casserole.

Soften the cream cheese

Room-temperature cream cheese blends into the sauce much more easily. If it’s cold and firm, you may end up with small lumps.

Don’t make the sauce too thick

The pasta absorbs some of the sauce while baking. A sauce that looks slightly loose before baking usually gives you a creamier finished casserole.

Grate your own cheese when possible

Freshly shredded cheese generally melts more smoothly than pre-shredded cheese, making the casserole especially creamy and cohesive.

Can You Make Chicken Spaghetti Without Velveeta?

Absolutely. This recipe is specifically designed as chicken spaghetti without Velveeta.

Cream cheese provides richness and body, while cheddar and mozzarella give the casserole that familiar cheesy finish. Sour cream adds a subtle tang that keeps the sauce from tasting overly heavy.

If you prefer the flavor and texture of a traditional chicken spaghetti recipe with Velveeta, you can substitute about 6–8 ounces of cubed Velveeta for part of the cheddar and mozzarella. Melt it into the sauce before combining it with the pasta.

Can I Use Rotisserie Chicken?

Yes. Rotisserie chicken is one of the easiest ways to make this casserole.

Remove the skin and bones, shred about 3 cups of meat, and add it directly to the sauce. Because the chicken is already cooked, you only need to warm it through before the casserole goes into the oven.

This shortcut is especially useful when you’re looking for a chicken noodle casserole easy enough for a busy evening.

What Makes This Different from Chicken Tetrazzini?

Chicken spaghetti and chicken tetrazzini casserole are both creamy baked pasta dishes, but their flavors are different.

Chicken tetrazzini traditionally leans toward a creamy, savory sauce with ingredients such as mushrooms, Parmesan, and sometimes wine. Spaghetti chicken is usually more tomato-forward and often includes cheddar, peppers, tomatoes, or a tomato-based sauce.

Both are comforting casseroles, but this chicken spaghetti has the familiar flavor combination of tomato, chicken, pasta, and melted cheese.

Can I Use Other Pasta?

Yes. Spaghetti is traditional, but several pasta shapes work well.

Try:

• Linguine
• Thin spaghetti
• Fettuccine
• Penne
• Rotini
• Elbow macaroni

If you use macaroni, you’ll end up with something closer in shape to a chicken macaroni casserole, but the same creamy chicken-and-cheese flavors still work beautifully.

Storage Tips

Allow leftovers to cool, then cover the baking dish tightly or transfer the casserole to airtight containers.

Refrigerate for up to 3–4 days.

When reheating individual portions, add a small splash of chicken broth or milk before microwaving. This helps loosen the sauce and keeps the pasta from drying out.

For larger portions, cover with foil and reheat in a 325°F oven until warmed through.

Can You Freeze Chicken Spaghetti?

Yes. Chicken spaghetti is an excellent make-ahead casserole.

For best results, assemble the casserole in a freezer-safe baking dish but leave off the final cheese topping. Cover tightly with plastic wrap followed by aluminum foil.

Freeze for up to 2–3 months for the best quality.

Thaw overnight in the refrigerator, add the cheese topping, and bake until heated through and bubbling. If the casserole is still very cold in the center, it may need additional baking time.

Variations

Add bell peppers

Diced red or green bell peppers add sweetness, color, and a little texture. This is also a nice way to bring the vegetable element often found in classic chicken spaghetti recipes.

Make it spicy

Add extra red pepper flakes, diced green chiles, or a pinch of cayenne for more heat.

Add vegetables

Stir in sautéed mushrooms, spinach, broccoli, or peas for a more substantial casserole.

Try a different cheese blend

Sharp cheddar gives you a stronger flavor, while Monterey Jack makes the casserole especially creamy. Pepper Jack is excellent if you like a little heat.

Make it more tomato-forward

For those who prefer chicken with spaghetti sauce, increase the tomato sauce slightly and reduce the chicken broth by the same amount.

Frequently Asked Questions

Can I make chicken spaghetti ahead of time?

Yes. Assemble the casserole, cover it tightly, and refrigerate it for up to 24 hours before baking. Let the dish sit at room temperature for about 20–30 minutes while the oven preheats, then bake until hot and bubbly.

Can I use canned chicken?

You can, although freshly cooked or rotisserie chicken usually gives better flavor and texture. If using canned chicken, drain it well and break up any large pieces before adding it to the sauce.

Can I make this recipe with leftover turkey?

Yes. Cooked turkey can replace the chicken at a 1:1 ratio. It’s an especially useful recipe to keep around after a holiday meal.

Why did my chicken spaghetti turn out dry?

The most common reasons are overcooking the spaghetti, using too little sauce, or baking the casserole for too long. Keep the sauce slightly loose before baking and cover the casserole for the first part of baking to help retain moisture.

Can I make this without canned soup?

Yes. You don’t need cream of mushroom or cream of chicken soup for this recipe. The combination of cream cheese, sour cream, chicken broth, tomato sauce, and shredded cheese creates the creamy sauce from scratch.

Can I use Velveeta?

Yes. While this recipe is designed to be made without Velveeta, you can replace part of the shredded cheese with cubed Velveeta if you prefer an exceptionally smooth, classic cheese sauce.

What to Serve With Chicken Spaghetti Casserole

Because this casserole is rich and filling, simple sides work best.

Serve it with:

• Crisp green salad
• Steamed broccoli
• Roasted green beans
• Garlic bread
• Dinner rolls
• Roasted vegetables
• Simple cucumber salad

A fresh green salad is particularly nice because its crisp texture balances the creamy baked pasta.