In a large skillet, brown the ground beef over medium heat for 5–7 minutes.
Add onion and garlic, cooking until softened, about 3–4 minutes.
Stir in mushrooms and cook until tender, about 5 minutes.
Sprinkle flour over the mixture, stir, and gradually add broth while stirring.
Simmer 3–5 minutes until slightly thickened.
Reduce heat, stir in sour cream, and season with salt and pepper.
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Serve over egg noodles or rice, garnished with parsley if desired.