INGREDIENTS
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2 large sweet onions, peeled, halved, and thinly sliced
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8 tablespoons unsalted butter, divided
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1/3 cup mayonnaise
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2 tablespoons ketchup
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1/2 teaspoon yellow mustard
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1/4 teaspoon garlic powder
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1/4 teaspoon ground black pepper
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4 Chop House by Holten Angus Sirloin Steak Burgers
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8 slices thick cut sourdough or rye bread
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4 slices medium cheddar cheese
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4 slices swiss cheese
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