Fiesta Chicken Casserole

Fiesta Chicken Casserole 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) cans Fiesta nacho cheese soup 1 (10 ounce) cans mild Rotel tomatoes & chilies, diced, not drained 1 (4 ounce) cans sliced black olives, drained 8 ounces Velveeta cheese, cut into 1/2 inch cubes 6 ounces sliced mushrooms ( divided) Cook spaghetti according to package directions until almost tender, drain. While spaghetti is cooking, mix next 8 ingredients and 6 ozs. mushrooms in large bowl. Add spaghetti and mix well. Spray a large casserole pan 9x13 with cooking spray. Pour mixture into casserole. Spread remaining mushrooms on top. Bake covered at 350 degrees for 45 minutes to 1 hour until chicken is done. Remove cover and bake additional 15 minutes until bubbly and slightly browned. Makes 6 servings