Tex-Mex Chicken Casserole

Step 1
Preheat oven to 350 degrees F (175 degrees C).

Step 2
Lightly grease a 9×13-inch baking dish. Spread corn chip crumbs over the bottom of the baking dish and press crumbs into place.

Step 3
Melt butter in a large skillet over medium-high heat; cook and stir onion in melted butter until tender, 6 to 7 minutes.

Step 4
Stir diced tomatoes, cream of chicken soup. cream of mushroom soup, green chiles, milk, sour cream, chili powder, and cumin in a large bowl. Add chicken and cooked onion; stir to combine. Pour mixture over corn chips and top with Cheddar cheese.

Step 5
Bake in the preheated oven until bubbly and cheese is melted, 55 to 60 minutes. Let stand for 10 minutes before serving.