01 -
Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish.
02 -
In a skillet, cook ground beef, mushrooms, and onion until beef is browned; drain excess fat.
03 -
In a bowl, combine beef mixture, uncooked rice, cream of mushroom soup, beef broth, sour cream, garlic powder, salt, and pepper.
04 -
Pour into baking dish, cover with foil, and bake for 50–60 minutes, until rice is tender.
05 -
Uncover, sprinkle with cheese (if using), and bake 5 more minutes.
06 -
Let sit a few minutes before serving.