01 -
Preheat oven to 350°F (175°C).
02 -
Heat a large pot over medium-high heat and brown the ground beef. Season with salt, pepper, and Italian seasoning. Drain grease, transfer beef to a plate, and cover with foil.
03 -
Melt 2 tablespoons of butter in the same pot. Add diced onions and cook for 5 minutes until softened. Add minced garlic and cook for 1 additional minute.
04 -
Add beef broth, remaining 1 tablespoon of butter, and rice to the pot. Stir to combine. Bring to a boil, reduce heat to a simmer, and cover tightly. Cook for 10 minutes.
05 -
Add sliced mushrooms to the pot, replace the cover, and continue cooking for 5-10 more minutes. Do not stir the rice. Refer to the rice package for exact cooking time.
06 -
Turn off the heat, leave the cover on, and let the rice stand for 10 minutes without stirring. This allows any rice stuck at the bottom to release.
07 -
Add the cooked ground beef, cream of mushroom soup, milk, sour cream, and half of the shredded cheddar cheese to the pot. Stir to combine.
08 -
Lightly grease a 9 x 13-inch casserole dish. Transfer the mixture to the dish and spread evenly. Top with the remaining cheddar cheese.
09 -
Cover the casserole dish and bake in the preheated oven for 20 minutes. Serve warm.