In a large bowl, combine eggs, onion, bread crumbs, cheese, parsley, 1/2 teaspoon of the salt, and 1/2 teaspoon of the pepper. Add ground beef; mix well. Shape mixture into forty 1-1/4-inch meatballs. In a large skillet, heat 1 tablespoon oil; brown meatballs, half at a time. Drain on paper toweling.