Garlic Mushroom Toastie is a delicious and easy-to-make sandwich filled with sautéed garlic mushrooms and melted cheese. The mushrooms are cooked with garlic, butter, and herbs until they are tender and flavorful. The sandwich is then assembled with the mushroom filling and cheese, and toasted until the bread is crispy and the cheese is melted. It is a perfect snack or light meal option.