In a large bowl combine bread crumbs, cheese, egg, apple, mustard, parsley, salt, and pepper. Mix well. Add turkey and mix to just combine. Shape into 12 2-inch meatballs.
In a large skillet, heat oil over medium heat. Add meatballs. Cook about 15 minutes or until cooked through (165 degree F.), turning frequently to brown evenly. (Or, make 24 1-1/4-inch meatballs and cook for 12 minutes.)
Meanwhile, prepare glaze. In a small saucepan combine apple juice, maple syrup, and vinegar. Bring to boiling; reduce heat. Simmer, uncovered, for 15 minutes or until reduced by about half and is slightly thickened,stirring occasionally.
Combine meatballs and glaze. Thread on skewers, if desired, to serve. Makes 4 servings.