Mushroom Swiss Basket Our Mushroom Swiss Basket is a savory favorite, featuring a fresh, never-frozen seasoned beef patty topped with melted Swiss cheese, sautéed mushrooms, and grilled onions. Finished with crisp lettuce and our signature SuperBurger Sauce on a buttery toasted brioche bun, every bite is rich, juicy, and packed with bold flavor. Served with a generous helping of our golden, crispy crinkle-cut fries, this basket is the perfect choice for anyone craving a hearty, satisfying meal. 🍔🍟