Creamy Chicken Spaghetti Bake Recipe
Introduction
Chicken spaghetti is a comforting, creamy casserole that combines tender chicken, cheese, and pasta for a satisfying meal. This easy-to-make dish is perfect for weeknight dinners or a cozy family gathering.

Ingredients
- 2 small boneless skinless chicken breasts
- 2 teaspoons Italian seasoning
- Salt and pepper, to taste
- 2 tablespoons olive oil
- 4 tablespoons butter
- 1 small yellow onion, diced
- 3 cloves garlic, minced
- 4 tablespoons flour
- 1 ½ cups chicken broth
- ¾ cup milk
- 4 oz. cream cheese, softened
- 1 cup cheddar cheese, shredded
- 10 oz. diced tomatoes with green chilies
- ½ lb. thin spaghetti
- 1 cup mozzarella cheese, shredded
- Red pepper flakes, for garnish
- Chopped parsley, for garnish
Instructions
- Step 1: Preheat your oven to 400 degrees Fahrenheit.
- Step 2: Prepare the chicken by slicing each breast in half lengthwise to create thinner pieces. Pat them dry and season lightly with salt, pepper, and Italian seasoning.
- Step 3: Heat olive oil over medium-high heat in a skillet. Sear the chicken slices for about 5-6 minutes on each side until cooked through. Remove from heat, let cool slightly, and dice into bite-sized pieces.
- Step 4: Reduce heat to medium-low and melt butter in the same pot. Use a spatula to scrape up any browned bits left from cooking the chicken; these add great flavor.
- Step 5: Add diced onion and cook until soft, about 4 minutes. Stir in minced garlic and cook for an additional 1 minute.
- Step 6: Sprinkle flour over the onions and toss to coat. Cook for 2 minutes until the raw flour smell disappears.
- Step 7: Gradually add chicken broth in small splashes, stirring constantly to keep the sauce smooth and thick. Then slowly whisk in the milk until fully combined.
- Step 8: While the sauce simmers, bring a large pot of salted water to a boil and cook the spaghetti according to package instructions. Drain well.
- Step 9: Stir softened cream cheese into the sauce until melted and smooth. Reduce heat to low and sprinkle in shredded cheddar cheese, stirring until blended.
- Step 10: If you want a thinner sauce, add a little of the juice from the diced tomatoes. Otherwise, drain the juice completely. Add the diced tomatoes and cooked chicken, stirring to combine.
- Step 11: Mix in the cooked spaghetti. If your pot isn’t oven-safe, transfer the mixture to a lightly greased 9×13-inch casserole dish.
- Step 12: Sprinkle shredded mozzarella evenly over the top. Bake uncovered for 15 minutes.
- Step 13: For a golden-brown top, broil for 1-2 minutes at 475 degrees Fahrenheit, watching carefully to avoid burning.
- Step 14: Remove from oven and garnish with red pepper flakes and fresh chopped parsley before serving.
Tips & Variations
- Use rotisserie chicken for a quicker version or leftover cooked chicken.
- Substitute half-and-half for milk for a richer sauce.
- Add chopped bell peppers or mushrooms with the onions for extra veggies.
- Use gluten-free pasta and flour to make this recipe gluten-free.
- For extra spice, stir in a pinch of cayenne pepper alongside the red pepper flakes.
Storage
Store leftover chicken spaghetti in an airtight container in the refrigerator for up to 3 days. Reheat in the microwave or oven until warmed through. If the sauce thickens upon chilling, add a splash of milk while reheating to loosen it.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I make this recipe ahead of time?
Yes, you can assemble the casserole a day in advance and refrigerate it. Bake it fresh when ready to serve, adding a few extra minutes to the baking time if chilled.
Can I freeze chicken spaghetti?
Absolutely. Freeze leftovers in a freezer-safe container for up to 2 months. Thaw overnight in the refrigerator before reheating to maintain the best texture.
Print
Creamy Chicken Spaghetti Bake Recipe
- Total Time: 50 minutes
- Yield: 4 servings 1x
Description
A creamy, cheesy chicken spaghetti casserole featuring tender seared chicken, a rich cream cheese and cheddar sauce, diced tomatoes with green chilies, and a golden mozzarella topping baked to perfection. This comforting dish combines flavorful spices and a smooth, velvety sauce for a hearty and satisfying meal.
Ingredients
Chicken
- 2 small boneless skinless chicken breasts
- 2 teaspoons Italian Seasoning
- Salt and Pepper, to taste
- 2 Tablespoons olive oil
Sauce
- 4 Tablespoons butter
- 1 small yellow onion, diced
- 3 cloves garlic, minced
- 4 Tablespoons flour
- 1 ½ cups chicken broth
- ¾ cup milk
- 4 oz. cream cheese, softened
- 1 cup cheddar cheese, shredded
- 10 oz. diced tomatoes & green chilies (drained, reserve juice)
Pasta and Topping
- ½ lb. thin spaghetti
- 1 cup mozzarella cheese, shredded
- Red pepper flakes, for garnish
- Chopped fresh parsley, for garnish
Instructions
- Preheat Oven: Preheat your oven to 400°F (200°C) to prepare for baking the casserole.
- Prepare and Cook Chicken: Slice each chicken breast in half lengthwise to create thinner cutlets. Pat dry and season both sides lightly with salt, pepper, and Italian seasoning. Heat olive oil in a skillet over medium-high heat and sear chicken pieces for 5-6 minutes per side until fully cooked. Remove from heat and let cool, then dice into bite-sized pieces.
- Make the Sauce – Melt Butter and Cook Aromatics: In the same pot used for chicken, reduce heat to medium-low and melt butter, scraping up any browned bits (fond) for added flavor. Add diced onion and cook until softened, about 4 minutes. Stir in minced garlic and cook for an additional minute.
- Add Flour to Form Roux: Sprinkle the flour evenly over the onions and garlic, stirring constantly to coat and cook the flour for about 2 minutes to eliminate raw taste.
- Add Liquids Gradually: Slowly add chicken broth in small splashes, stirring continuously to maintain a smooth consistency. Follow by gradually whisking in the milk until combined and the sauce is smooth.
- Boil Pasta: While sauce simmers and reduces slightly, bring a large pot of salted water to a boil. Cook the spaghetti according to package instructions until al dente, then drain and set aside.
- Melt Cream Cheese: Lower heat to a gentle simmer. Add the softened cream cheese to the sauce and stir continuously until melted and fully incorporated to create a creamy base.
- Add Cheddar Cheese: Reduce heat to low, then sprinkle shredded cheddar cheese into the sauce and stir until melted and combined.
- Add Tomatoes and Chicken: If the sauce seems too thick, add a small amount of reserved tomato juice to thin. Drain the diced tomatoes and green chilies and add them to the sauce along with the diced cooked chicken. Stir to combine.
- Combine Pasta and Sauce: Stir the cooked spaghetti into the sauce evenly. If your cooking pot is not oven-safe, transfer the mixture to a lightly greased 9×13 inch casserole dish for baking.
- Top with Mozzarella and Bake: Sprinkle shredded mozzarella cheese evenly on top of the casserole. Bake uncovered in the preheated oven for 15 minutes until bubbly and heated through.
- Broil for Browning: To achieve a golden brown top, broil the casserole for 1-2 minutes at 475°F, watching carefully to avoid burning.
- Garnish and Serve: Remove from oven and sprinkle with red pepper flakes and freshly chopped parsley for an added kick and color. Serve hot and enjoy!
Notes
- You can substitute cooked rotisserie chicken for quicker preparation.
- Ensure cream cheese is softened to help it melt smoothly into the sauce.
- Reserve some tomato juice to adjust sauce thickness if needed.
- Use oven-safe cookware to bake directly in the same pot to reduce cleanup.
- Keep a close eye during broiling as cheese can burn quickly.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Main Course
- Method: Baking
- Cuisine: American
Keywords: chicken spaghetti, cheesy chicken casserole, baked spaghetti, creamy chicken pasta, comfort food, easy dinner

