A delicious mushroom cream sauce made with sautéed onions and mushrooms, combined with heavy cream, Worcestershire sauce, Dijon mustard, and Parmesan. Perfect for flat iron steak!
1: Sauté onions and mushrooms in a pan with some olive oil, salt, and pepper.
2: In the same pan, add heavy cream, Worcestershire sauce, Dijon mustard, grated Parmesan cheese, and cracked black pepper.
3: Cook until the sauce is heated through and well combined.
