Classic Patty Melt

ground chuck

large Vidalia or yellow onion , halved and sliced

canola or vegetable oil

unsalted butter , plus additional softened butter for the bread slices

slices of Swiss, Provolone, American , or your favorite sliced cheese

slices of rye, sourdough or other bread

Special Sauce , optional {recipe below}

Garlic salt and freshly cracked black pepper ,