Creating this delightful dish is straightforward and can be accomplished in under 30 minutes. Follow these steps for a perfect Beef and Mushroom Stroganoff:

1. Heat olive oil in a large skillet over medium heat. Add onions and garlic, sauté until soft and fragrant.
2. Add the sliced beef to the skillet, cooking until browned. Make sure to season with salt and pepper to enhance the flavors.
3. Stir in the sliced mushrooms and cook until they soften, releasing their juices and melding with the beef.
4. Sprinkle flour over the mixture and stir well to ensure it’s evenly distributed.
5. Gradually add beef broth, stirring constantly. Let the mixture simmer for about 10 minutes until the sauce thickens.
6. Reduce heat and stir in the sour cream until fully combined. Warm the mixture through, but be careful not to let it boil, which could cause the sour cream to curdle.
7. Serve the stroganoff over a bed of egg noodles or rice, garnished with fresh parsley to add a touch of color and freshness.