Step 1

Preheat oven to 350°F.

Step 2

Open the bag of Doritos slightly at the top. Use your hands to crush the chips into roughly 1-inch pieces. Scatter half of the Doritos in the bottom of a 13x9 inch dish.

Step 3

In a large bowl, stir together the chicken, sour cream, chili powder, salt, and garlic powder. Spread over the Doritos.

Step 4

Sprinkle the remaining Doritos on top, and cover with the cheeses.

Step 5

Bake for 20 minutes, or until the cheese has melted and the casserole is warm throughout.