Take a skillet to roast the oyster mushrooms.
Drizzle a splash of olive oil into the skillet.
Roast the mushrooms in a skillet over medium heat.
Season the oyster mushrooms with a pinch of salt and black pepper.
Roast the mushrooms on both sides.
Chop the onions, mushrooms, yellow onions, and bell peppers.
Tear the sprigs of lettuce.
Toast the bread with unsalted butter on both sides to a golden brown.
Finally, begin to assemble the oyster mushroom sandwich.
Smear a tablespoon of mayonnaise on one-half of the bread.
Place bell peppers, mushrooms, yellow onions, cooked blue oysters, and mushrooms.
Sprinkle a teaspoon of smoked paprika, salt, and black pepper on the veggies.
Club the toast with the other half of the bread and serve to enjoy.