Gone are the days of boring, regular hamburgers! By adding sliced mushrooms, onions, and Swiss cheese to your beef patties, you've leveled up your griddle game with these easy (and cheesey) Mushroom Swiss Smash Burgers, cooked on a Pit Boss flat top griddle. Impress your friends and family at your next outdoor cookout, or serve up this simple meal on a weeknight and you have yourself a winning dinner, every time.