4In a large skillet, cook the ground beef over medium heat until browned. Drain any excess fat.
Add the diced onion and minced garlic to the skillet. Cook until the onion is translucent, about 5 minutes.
Add the sliced mushrooms to the skillet and cook until they are tender, about 5 minutes.
Sprinkle the flour over the beef and mushroom mixture. Stir well to combine and cook for 1-2 minutes to remove the raw flour taste.
Gradually add the beef broth, stirring constantly to avoid lumps. Bring the mixture to a simmer and cook until it thickens, about 5 minutes.
Remove the skillet from the heat and stir in the sour cream. Mix well until the sauce is smooth and creamy.
Serve the Beef and Mushroom Stroganoff over cooked egg noodles or rice, if desired. Enjoy!