Ooey Gooey Cheesy Meatballs

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