"This classic patty melt recipe combines a grilled burger with melty cheese and caramelized onions sandwiched between two slices of buttery toasted bread...."
INGREDIENTS
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4 slices marble rye bread
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2/3 pound ground beef (85/15)
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1 cup sliced onion (1 medium onion)
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2 Tablespoons Montreal steak seasoning (divided)
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4 Tablespoons melted butter
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2 slices cheese (Swiss or cheddar for topping the burger)
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1/2 cup shredded cheddar cheese
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1/2 cup shredded Swiss cheese