Preheat your oven to 350°F and grease a 9x13-inch baking dish.
In a large bowl, mix the cooked chicken, rice, vegetables, cream of chicken soup, sour cream, cheddar cheese, garlic powder, onion powder, salt, and pepper.
Spread the mixture evenly into the prepared baking dish.
Sprinkle extra cheddar cheese on top for that irresistible golden crust.
Bake uncovered for 25 to 30 minutes until heated through and the cheese is bubbling.
Let it cool slightly before serving. (Yes, this part is hard.)