Step 1

Preheat oven to 350 degrees. Cook pasta according to package directions.

Step 2

Melt butter in a Dutch oven over medium heat. Add onion and bell pepper and cook 5 minutes.

Step 3

Stir in Rotel tomatoes and Velveeta cheese. Cook, stirring continuously until cheese melts.

Step 4

Mix in chicken, cream of chicken soup, sour cream, ancho chili powder, and cumin.

Step 5

Add pasta and half of both cheddar cheese and Monterey cheese.

Step 6

Pour into a greased 10-inch cast iron pan or 11X7-inch casserole dish. Sprinkle with remaining cheese and crushed Doritos.

Step 7

Bake until bubbly, for 25 to 30 minutes.