Preheat oven to 350 degrees.
In a mixing bowl combine the chicken, cheese, sour cream, taco seasoning, Rotel, and cream of chicken soup.
Mix that up really well so all of the flavors are combined.
Spray a 2-Quart casserole baking dish with cooking spray
Layer crushed Doritos, 2/3 cheesy chicken mixture, 1/2 crushed Doritos, remaining cheesy chicken mixture, remaining Doritos
Bake for 25 minutes