The Original Beauty

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Kosher salt

1 tablespoon Old Bay Seasoning

1 tablespoon paprika

1 tablespoon chili powder

1 tablespoon garlic salt

For the special sauce:

1 cup mayonnaise

1 cup ketchup

1/2 teaspoon yellow mustard

1 canned chipotle chile in adobo sauce,

finely chopped

For the toppings:

2 tablespoons extra-virgin olive oil

8 ounces white button mushrooms (about 15), thinly sliced

1 small onion, thinly sliced

Kosher salt and freshly ground pepper

For the burgers:

Vegetable oil, for the grill

2 pounds ground beef chuck

4 slices Swiss cheese

4 sweet Hawaiian hamburger buns, split