Preheat Oven:
Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish.
Prepare the Filling:
In a large bowl, combine cooked chicken, cream of chicken soup, sour cream, shredded cheddar, milk, garlic powder, onion powder, salt, and pepper. Mix until well combined.
Assemble the Casserole:
Pour the chicken mixture into the prepared baking dish and spread evenly.
Sprinkle crushed Doritos evenly over the top. Add extra shredded cheese if desired.
Bake:
Bake for 25–30 minutes, until the casserole is bubbly and the Doritos topping is golden and crispy.
Serve:
Garnish with chopped green onions or parsley if desired. Serve hot.
