Preheat the oven to 375°F (190°C). Grease a 9x13-inch baking dish.
In a large mixing bowl, combine the uncooked rice, chicken broth, cream of mushroom soup, cream of chicken soup, and milk.
Stir in garlic powder, onion powder, salt, and black pepper until well blended.
Spread half of the mixture into the prepared baking dish.
Add the shredded chicken over the mixture and then top with the remaining rice mixture.
Sprinkle shredded cheddar cheese evenly over the top.
Mix breadcrumbs with melted butter and sprinkle on top (optional).
Cover the dish with aluminum foil and bake for 40 minutes.
Remove foil and bake for an additional 10-15 minutes or until the cheese is golden and bubbly.
Let the casserole rest for 5 minutes before serving.