In a large mixing bowl, combine the rice, chicken broth, cream of mushroom soup, cream of chicken soup, diced onion, garlic powder, paprika, and black pepper.
Place the chicken breasts on top of the rice mixture and season with a little more paprika and black pepper if desired.
Cover the baking dish tightly with aluminum foil and bake for 50 minutes.
Remove the foil, sprinkle the shredded cheddar cheese on top, and bake for an additional 10 minutes or until the cheese is melted and bubbly.
Allow the casserole to rest for a few minutes before serving.
Notes
You can add some frozen peas or chopped vegetables to increase the nutritional value of this dish.