A juicy patty melt with caramelized onions and melted Swiss on griddled rye is a high protein diner classic. This satisfying sandwich delivers bold, savory flavors the whole family craves.
Slice onions thinly. In a skillet over medium-low heat, add 2 tbsp butter and sauté onions, stirring occasionally, for 18–20 minutes until deep golden and caramelized.
Form ground beef into 4 thin oval patties matching the rye bread shape. Season patties with salt, pepper, and Worcestershire sauce on both sides.
In a separate skillet or griddle over medium-high heat, sear the beef patties for 3–4 minutes per side, just until browned and cooked through. Rest patties briefly.
Lay out rye bread slices. On each, layer Swiss cheese, a cooked patty, a generous scoop of caramelized onions, and a second slice of Swiss cheese. Top with the second bread slice.
Wipe the griddle clean. Over medium heat, melt remaining butter and griddle each sandwich 3–4 minutes per side, applying gentle pressure, until bread is golden and cheese is fully melted. Slice and serve immediately.