Preheat oven to 375°F (190°C). Spray a 9 x 13-inch baking dish with cooking spray and set aside.
In a large bowl, add in the chicken, cream of chicken soup, rice, broccoli, sour cream, ½ cup of shredded cheese, garlic powder, paprika, and salt/pepper to taste. Mix together until combined.
Spoon the mixture into the prepared baking dish and sprinkle the rest of the shredded cheese on top.
Bake for about 20-30 minutes, or until the cheese is melted and golden, and broccoli is tender.