INGREDIENTS
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1 pound ground beef (85 percent lean)
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1 large egg, lightly beaten
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1 medium yellow onion, half grated, the other half thinly sliced
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1/4 teaspoon garlic powder
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1 teaspoon kosher salt
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1 teaspoon freshly ground black pepper
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12 slices white bread
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2 tablespoons unsalted butter, softened
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12 slices American cheese, optional