Cast Iron Patty Melt

Cast Iron Patty Melt was pinched from <a href="https://southernbite.com/cast-iron-patty-melts/" target="_blank" rel="noopener">southernbite.com.</a>
INGREDIENTS
2 large sweet onions, peeled, halved, and thinly sliced
8 tablespoons unsalted butter, divided
1/3 cup mayonnaise
2 tablespoons ketchup
1/2 teaspoon yellow mustard
1/4 teaspoon garlic powder
1/4 teaspoon ground black pepper
4 Chop House by Holten Angus Sirloin Steak Burgers
8 slices thick cut sourdough or rye bread
4 slices medium cheddar cheese
4 slices swiss cheese
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