Prepare the chicken by shredding cooked chicken or cooking raw chicken in a skillet until no longer pink.
Measure out one cup of uncooked rice and set it aside.
In a large mixing bowl, combine cream of chicken soup, cream of mushroom soup, and chicken broth. Stir until blended.
Add shredded chicken, uncooked rice, frozen mixed vegetables, garlic powder, onion powder, salt, and black pepper to the mixing bowl. Mix until well combined.
Pour the mixture into a greased 9x13-inch baking dish, cover with aluminum foil, and bake at 350°F for 45 minutes. Remove foil, sprinkle cheese on top, and bake uncovered for an additional 15 minutes.
Let the casserole sit for 5-10 minutes before serving.