1Add shredded chicken, cooked rice, condensed cream of chicken soup, milk (fill the empty soup can halfway), frozen broccoli florets, sour cream, half of the grated cheese, and seasonings (garlic powder, onion powder, salt, pepper) into a large bowl.
2Mix everything until well combined.
3Spray a 9x13-inch casserole dish with cooking spray.
4Place the mixture into the casserole dish and evenly spread it out.
5Top the casserole with the remaining grated cheese.
6Melt the butter, crush the ritz crackers into it, and mix them together.
7Sprinkle the cracker and butter mixture over the top of the casserole.
8Bake in a 350-degree oven until the casserole is bubbly and the cheese is melted.