Katie Lee's Logan County Hamburgers

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1 pound 85-percent lean ground beef

1 large egg, lightly beaten

1 medium yellow onion, 1/2 grated and 1/2 thinly sliced

1/2 teaspoon garlic powder

1 teaspoon kosher salt

1 teaspoon freshly ground black pepper

2 tablespoons unsalted butter, softened

12 slices white bread

12 slices American cheese, optional

Toppings (any or all):

Mustard

Ketchup

Sliced tomatoes

Pickles