01 -
Preheat oven to 175°C. Lightly grease a 33 x 23 cm baking dish to prevent sticking.
02 -
In a large skillet over medium heat, cook ground beef, mushrooms, and onion, breaking up the beef, until browned and onions are translucent, about 10 minutes. Drain any excess fat.
03 -
In a large mixing bowl, blend the sautéed beef mixture with uncooked rice, cream of mushroom soup, beef broth, sour cream, garlic powder, salt, and black pepper. Stir thoroughly to ensure even distribution.
04 -
Transfer the mixture into the prepared baking dish and level the surface with a spatula.
05 -
Cover the dish tightly with foil and bake for 50–60 minutes, or until the rice is tender and most liquid is absorbed.
06 -
If using, remove the foil and evenly distribute the shredded cheddar over the surface. Bake uncovered for an additional 5 minutes, or until cheese is melted and bubbling.
07 -
Allow to stand for at least 3 minutes to let the sauce thicken before serving.