Whataburger · Fast Food
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Sauteed mushrooms and melted Swiss cheese top a beef patty on a toasted bun, forming a simple fast-food take on a diner-style combo. Cooked down until soft, the mushrooms bring a wetter, earthier layer against the beef and the mild, nutty cheese. It's been rotated in and out of the menu over the years, so it sits apart from the more permanent burgers. Built like a standard sandwich, the mushroom-and-Swiss topping does most of the work to distinguish it from the baseline offering.
