INGREDIENTS
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1 slice bread
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1/4 cup milk
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1 pound ground beef
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1 small onion, grated
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1 tablespoon sour cream
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1 large egg
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1/2 teaspoon salt
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1/2 teaspoon ground black pepper
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1/4 cup mayonnaise
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3/4 cup shredded mozzarella cheese
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1/4 cup grated Parmesan
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