Preparation Steps

• Season the beef slices with salt and pepper.
• In a large skillet, melt butter and olive oil over medium-high heat. Add the beef and cook until browned on all sides. Remove beef from skillet and set aside.
• Add the chopped onion to the same skillet and cook until softened, about 5 minutes.
• Add the sliced mushrooms and minced garlic to the skillet. Cook until mushrooms are browned and tender.
• Sprinkle flour over the mushroom and onion mixture and stir well. Cook for 1 minute.
• Gradually whisk in the beef broth and Worcestershire sauce. Bring to a simmer, scraping up any browned bits from the bottom of the skillet.
• Return the beef to the skillet. Reduce heat to low, cover, and simmer for 10-15 minutes, or until the beef is tender.
• Stir in the sour cream until well combined. Do not boil after adding sour cream.
• Taste and adjust seasoning with salt and pepper if needed. Serve hot over noodles or rice.