This creamy chicken spaghetti is the ultimate comfort food! Tender chicken, thin spaghetti, and a luscious three-cheese sauce—cream cheese, cheddar, and mozzarella—come together with diced tomatoes and green chilies for a rich, flavorful dish that’s perfect for weeknight dinners or casual gatherings.
2 small boneless skinless chicken breasts
2 teaspoons Italian seasoning
Salt & pepper, to taste
2 tablespoons olive oil
4 tablespoons butter
1 small yellow onion, diced
3 cloves garlic, minced
4 tablespoons all-purpose flour
1½ cups chicken broth
¾ cup milk
4 oz cream cheese, softened
1 cup cheddar cheese, shredded
10 oz diced tomatoes with green chilies (Rotel)
8 oz thin spaghetti
1 cup mozzarella cheese, shredded
Red pepper flakes & chopped parsley, for garnish
Preheat oven: Set to 400°F.
Cook chicken (optional):
Slice chicken in half lengthwise. Pat dry and season with salt, pepper, and Italian seasoning.
Heat olive oil over medium-high heat and sear chicken 5–6 minutes per side. Remove, let cool slightly, and dice into bite-sized pieces.
Make the sauce:
Reduce heat to medium-low in the same pot. Melt butter and scrape up any browned bits (“fond”) from the bottom.
Add onion and cook 4 minutes until softened. Add garlic and cook 1 minute.
Sprinkle flour over the onions, toss to coat, and cook 2 minutes to remove raw flour taste.
Gradually add chicken broth, whisking to maintain thickness. Add milk slowly, whisking until smooth.
Stir in cream cheese until melted and smooth. Reduce heat to low and add shredded cheddar, mixing well.
Combine ingredients:
If desired, thin sauce with a little tomato juice. Otherwise, drain juice and add diced tomatoes and cooked chicken.
Stir in cooked spaghetti. Transfer to a lightly greased 9×13-inch casserole dish if your pot isn’t oven-safe.
Bake:
Top with mozzarella cheese. Bake uncovered for 15 minutes.
Optional: Broil 1–2 minutes at 475°F to lightly brown the top—watch carefully.
Serve: Garnish with red pepper flakes and parsley. Pair with garlic bread for a complete meal.
Cheese tip: Use room-temperature cream cheese for easier melting.
Chicken shortcut: Use pre-cooked rotisserie chicken for a faster version.
Spicy variation: Add extra diced green chilies or red pepper flakes for more heat.
Make-ahead: Assemble in a casserole dish and refrigerate up to 24 hours before baking.