01 -
Combine the kosher salt, black pepper, onion salt, and garlic salt in a small bowl. Keep it beside the stove so you can season quickly.
02 -
Melt the butter in a small saucepan over low heat. Add the minced garlic and cook for 2-3 minutes until fragrant, stirring often. Do not brown the garlic.
03 -
Brush the cut sides of the buns with garlic butter. Toast them cut-side down in a hot skillet or on a griddle until golden, then set aside.
04 -
Divide the beef into 8 loose balls, about 3 oz (85 g) each. Do not pack them tightly.
05 -
Heat a cast iron skillet or griddle over medium-high heat. Add the beef balls and press each one into a thin patty with a sturdy spatula. Season the tops with the seasoning blend.
06 -
Cook for 1 1/2-2 minutes until the edges are browned. Flip once, add a slice of American cheese to each patty, and cook 1-2 minutes more, until the beef reaches 160°F.
07 -
Stack two cheesy patties on each bottom bun. Brush the top buns lightly with more garlic butter and sprinkle with a pinch of garlic salt. Add optional toppings and serve hot.