Smashburger Mushroom Swiss Chicken Sandwichs contain between 590-790 calories, depending on your choice of size. The size with the fewest calories is the Grilled Mushroom Swiss Chicken Sandwich (590 calories), while the Crispy Mushroom Swiss Chicken Sandwich contains the most calories (790 calories).
Choose from the sizes below to see the full nutrition facts, ingredients and allergen information.
