Copycat Smashburger French Onion Burger
"You won't want to miss out on this double meat burger with sauteed onions, Swiss cheese, Boursin cheese, all on an Onion bun...."
INGREDIENTS
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4 Onion Buns
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1 white onion sliced thin
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1 tablespoon butter
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2 pounds ground beef
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8 slices swiss cheese
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Boursin cheese
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2 teaspoons kosher salt
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2 teaspoons ground black pepper
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2 teaspoons garlic salt
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