This crock pot flat iron steak with portobello mushrooms and potatoes is a hearty and flavorful dish. The tender flat iron steak is slow-cooked with savory portobello mushrooms and potatoes, resulting in a melt-in-your-mouth texture and rich taste. The combination of the earthy mushrooms and tender steak creates a delicious and satisfying meal. Serve it with a side of steamed vegetables or a fresh salad for a complete and comforting dinner.