Heat a large skillet with a tight fitting lid over medium-high heat and lightly coat with olive oil. Sprinkle steaks with salt and pepper and add to skillet.
Cook for 3 minutes per side or until desired level of doneness is achieved. Remove from pan and keep warm. Add mushrooms, onion and garlic to the skillet and sauté for 5 minutes. Stir in broth.
Bring to a boil then reduce heat, cover and simmer for 3 minutes. Place sour cream in a medium bowl and gradually add mushroom mixture, whisking constantly.
Stir in minced parsley. Serve mushroom gravy with steaks and enjoy!!!