Preheat oven to 350 and spray a 2 quart casserole dish with cooking spray.
Put the chicken, 1 cup of the cheese, soup, milk, salsa and taco seasoning into a mixing bowl and stir until everything is mixed together.
Crush the Doritos into little pieces and spread half of them along the bottom of the casserole. Add half of the chicken mixture, then most of the rest of the Doritos, then the rest of the chicken mixture.
Scatter the rest of the cheese over the top of the casserole, and garnish with the rest of the Doritos.
Pop it all in the oven and bake for 30 minutes.
Let it cool for about 5 minutes, then scoop it out into bowls. Garnish with chopped scallions and a little sour cream and serve!
Notes
Chicken: You can use either boneless chicken breasts or chicken thighs, whichever you prefer!
Cream of Chicken Soup: Look for this creamy canned chicken soup in, yep, the soup aisle! It will give this casserole the texture we love.