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Close up of chicken spaghetti on a white plate ready to be eaten.

Best Chicken Spaghetti Casserole

This is hands down the Best Chicken Spaghetti Casserole. It is so easy to make and full of cheesy goodness. Made with juicy shredded chicken and pasta, then covered in a yummy cheese sauce and baked to perfection. This will become one of your family's favorite homemade meals.
5 from 3 votes
Prep Time 10 mins
Cook Time 50 mins
Total Time 1 hr
Course Main Course, pasta
Cuisine American
Servings 8
Calories 464 kcal


  • 16 oz spaghetti (cooked)
  • cups shredded chicken
  • 2 tbsp unsalted butter
  • 1 medium yellow onion (diced)
  • 2 cloves garlic (minced)
  • ½ green pepper (diced)
  • 1 tsp Italian seasoning
  • ½ tsp salt
  • 1 tsp ground black pepper
  • 1 15 oz can cream of chicken
  • 1 cup chicken broth
  • 1 15 oz can Ro-tel diced tomatoes & green chilies (drained)
  • cups Colby Jack cheese (grated and divided in 1 ½ cups and 1 cup)


  • Preheat the oven to 375 degrees. Then prepare a 9×13 baking dish by coating it with a non-stick cooking spray. Then set aside.
  • Boil 8 cups of water with a dash of salt in a large pot. Then, add spaghetti and cook one minute less than the directions on the box, or until cooked al dente and drain well.
  • In a large skillet over medium-high heat melt butter. Then add in garlic, green pepper, and onion. Cook 4-5 minutes or until onions become translucent.
  • Then, add in the diced tomatoes and green chilies, chicken broth, cream of chicken soup, Italian seasoning, salt, and black pepper. Mix well and bring to a simmer, cook for 2-3 minutes until sauce begins to thicken and is bubbly.
  • Lower heat to medium-low, add 1 1/2 cups of Colby Jack cheese. Mix well until the cheesy has completely melted and is smooth. Then remove from heat and set aside.
  • In a large mixing bowl or the pot, you made the spaghetti in. Add cooked spaghetti and shredded chicken. Then pour cheesy sauce over the top and mix until well incorporated.
  • In the prepared baking dish add in spaghetti and sauce mixture. Spread out evenly and cover the top with the remaining cheese.
  • Bake casserole for 25-30 minutes or until the cheese has completely melted and bubbly.
  • Serve while hot and enjoy!


*Nutrition Disclaimer: All information presented on this site is intended for informational purposes only. Nutrition facts are an estimate and not guaranteed to be accurate. I am not a certified nutritionist and any nutritional information shared on Modernmealmakeover.com should only be used as a general guideline.


Calories: 464kcalCarbohydrates: 40gProtein: 29.2gFat: 20.2gSaturated Fat: 10.8gCholesterol: 119mgSodium: 1101mgPotassium: 276mgFiber: 0.9gSugar: 2.5gVitamin D: 2µgCalcium: 289mgIron: 3mg
Keyword Best Chicken Spaghetti, Chcicken Spaghetti, Chicken Spaghetti Casserole
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