The Best Portobello Mushroom Burger recipe. Grilled, Oven Baked or Smoked. The perfect, simple vegetarian burger recipe option! Vegetarians & meat-eaters love this "burger." Delicious, easy & healthy marinade with balsamic, olive oils, rosemary and steak seasoning. Make vegan by subbing the cheese with avocado. Eat for Meatless Monday or any of the summer holidays like 4th of July, Memorial Day or Labor Day! / Running in a Skirt
grilled portobello mushroom burger that even a meat lover would love. The mushrooms are marinated then grilled and topped with melted Swiss Cheese, grilled red onion, tomatoes, spinach, and avocado, either use as a bun for a grilled burger, or serve with bacon.