Wipe out the skillet and add enough oil to coat the surface over medium heat.
2. Shape ground beef into patties, season with salt, and cook until browned, 3 to 5 minutes per side for medium-rare.
3. Place burgers on a wire rack. Butter one side of each bread slice.
4. In the skillet, place a slice of bread buttered side down, add cheese, patty, onions, more cheese, and another bread slice (buttered side up).
5. Cover and cook for 2 1/2 minutes, then flip and cook for 1 more minute.
6. Remove the patty melt from the skillet and repeat with remaining ingredients. Devour hot
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