Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the cooked chicken, uncooked rice, cream of chicken soup, chicken broth, mixed vegetables, garlic powder, onion powder, salt, and pepper.
Mix well until all ingredients are combined.
Pour the mixture into a greased 9x13-inch baking dish.
Cover the dish with aluminum foil and bake for 45 minutes.
Remove the foil, sprinkle shredded cheese on top, and bake for an additional 15 minutes or until the cheese is bubbly and golden.
Let it cool for a few minutes before serving.