Gather all ingredients.

Mix ground beef, Worcestershire sauce, pepper, and garlic salt together in a bowl until well combined.

Form into eight thin patties, each slightly larger than a cheese slice.

Cut each slice of American cheese into 4 equal pieces; stack the pieces.

Sandwich one stack of cheese between 2 ground beef patties. Tightly pinch the edges together to seal around the cheese. Repeat with the remaining cheese and patties.

Heat a large cast-iron skillet over medium heat. Cook patties in the hot skillet until well browned, about 4 minutes; they will puff up due to steam from the melting cheese.

Flip patties, prick the tops to release steam, and cook until browned on the other side and no longer pink in the center, about 4 more minutes. An instant-read thermometer inserted into the center should read at least 160°F (70°C).