A 100% vegan sandwich made with smoked mushroom bacon, tomato, lettuce, and avocado.
Spread 1 teaspoon of mayonnaise on each side of the bread slices. Preheat a heavy skillet or griddle over medium-low heat for 5 minutes. Add bread in a single layer, working in batches if necessary, and cook until golden brown. Flip and cook until second side is golden brown. Transfer bread to a cutting board.
Spread remaining mayonnaise on one side of each slice of bread. Stack lettuce and tomato evenly between two slices of bread. Season tomatoes with salt. Top with mushroom "bacon" and avocado. Close sandwiches, cut in half, and serve.