For an extra layer of flavor, try adding caramelized onions to the sandwich. Feel free to substitute the flat iron steak with another cut, such as sirloin or ribeye, adjusting the cooking time as needed. If you don't have an outdoor grill, you can use a grill pan or skillet on the stovetop. Experiment with different types of mushrooms, such as cremini or shiitake, for a unique twist.
Mohammed Lowe
Jun 25, 2025I made this for a BBQ and everyone raved about it!
William Ebert
Jun 5, 2025This is the best steak sandwich I've ever had!
Loyce Huel
Jun 5, 2025This recipe is amazing! The steak was so tender and flavorful.
Janiya Macgyver
May 24, 2025My family loved this recipe! It's a new favorite.
Eliza Veum
Mar 17, 2025I followed this recipe exactly and it turned out perfect. Thanks for sharing!
Jarrell Mertz
Mar 9, 2025The marinated mushrooms are a game-changer! They add so much depth of flavor.