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A forkful of cheesy chicken spaghetti hovering over its plate
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5 from 4 votes

Cheesy Chicken Spaghetti

Cheesy Chicken Spaghetti is a family comfort food favorite! This recipe uses a from-scratch sauce that is super easy to make so that your delicious cheesy casserole is ready for the oven in just 15 minutes.
Prep Time15 mins
Cook Time30 mins
Total Time45 mins
Course: Main Dish
Cuisine: American
Keyword: Chicken Spaghetti
Servings: 6 servings
Calories: 556kcal


  • 8 ounces spaghetti
  • 2 tablespoons butter
  • 1 medium white onion diced
  • 1 green bell pepper diced
  • 2 cloves garlic minced
  • 1/4 cup all-purpose flour
  • 2 cups milk
  • 3 cups shredded cheddar cheese divided
  • 15 ounces canned diced tomatoes drained
  • 4 ounces canned diced green chiles drained
  • 2 cups cooked diced chicken
  • 1/2 teaspoon salt
  • 1/2 teaspoon black pepper


  • Preheat oven to 350 degrees. Cook spaghetti in a saucepan according to package directions.
  • Meanwhile, melt butter in a large pot over medium-high heat. Add in onion and bell pepper and cook until softened, about 5-7 minutes.
  • Add in garlic and flour and continue to cook 2 more minutes. Slowly stir in milk and bring to a simmer until thickened. Once the sauce thickens, immediately remove from heat.
  • Stir in 2 cups cheddar cheese until melted and smooth. Then stir in diced tomatoes, diced green chilis, diced cooked chicken, and drained spaghetti. Season with salt and pepper to taste.
  • Pour pasta into a lightly greased 9x13 pan. Top with remaining 1 cup cheddar cheese. Bake in the preheated oven for 25 to 30 minutes until cheese is warm and bubbly and starting to brown.



Instead of cheddar cheese, mix things up with Monterey jack, mozzarella, pepper jack, or a Mexican cheese blend. 


Calories: 556kcal | Carbohydrates: 44g | Protein: 28g | Fat: 30g | Saturated Fat: 17g | Cholesterol: 95mg | Sodium: 870mg | Potassium: 497mg | Fiber: 3g | Sugar: 8g | Vitamin A: 1056IU | Vitamin C: 31mg | Calcium: 592mg | Iron: 2mg