How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Chicken Fiesta Casserole?

You need 9 ingredients. The key ingredients include: 8 ounces thin spaghetti, 4 boneless skinless chicken breast halves, cut into cubes, 1/2 large onion, chopped, 1/2 bell pepper, chopped, and more.

Is Chicken Fiesta Casserole suitable as meat & poultry?

Yes, Chicken Fiesta Casserole falls under the Meat & Poultry category and is a great choice for this type of meal.

How do I store leftover Chicken Fiesta Casserole?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Chicken Fiesta Casserole Recipe

Name: Chicken Fiesta Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 8 ounces thin spaghetti; 4 boneless skinless chicken breast halves, cut into cubes; 1/2 large onion, chopped; 1/2 bell pepper, chopped; 1 (10 ounce) can Fiesta nacho cheese soup; 1 (10 ounce) can mild Rotel tomatoes & chilies, diced, not drained; 1 (4 ounce) can sliced black olives, drained; 8 ounces Velveeta cheese, cut into 1/2 inch cubes; 6 ounces sliced mushrooms (divided)

Try this homemade Chicken Fiesta Casserole recipe the whole family will love. Made with thin spaghetti, chicken breast halves, onion and bell pepper. Ea…

This Chicken Fiesta Casserole relies on simple, everyday ingredients such as thin spaghetti, large onion, chopped, bell pepper, chopped and sliced mushrooms (divided). It comes together quickly and makes 4 servings, at about 516 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Meat & Poultry

Servings: persons

8 ounces thin spaghetti
4 boneless skinless chicken breast halves, cut into cubes
1/2 large onion, chopped
1/2 bell pepper, chopped
1 (10 ounce) can Fiesta nacho cheese soup
1 (10 ounce) can mild Rotel tomatoes & chilies, diced, not drained
1 (4 ounce) can sliced black olives, drained
8 ounces Velveeta cheese, cut into 1/2 inch cubes
6 ounces sliced mushrooms (divided)

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Quick Info

Servings
4 servings
Calories
516 kcal
Category
Meat & Poultry

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