In a small bowl, combine the first six ingredients; stir in apple and raisins. Combine the buttermilk, egg yolk, butter and vanilla; stir into dry ingredients. In a small bowl, beat egg white until soft peaks form; fold into batter.
Pour batter by heaping 1/4 cupfuls onto a hot griddle coated with cooking spray; turn when bubbles form on top. Cook until the second side is lightly browned.
Meanwhile, in a small saucepan, combine the sugar, cornstarch and cider until smooth; add cinnamon stick. Bring to a boil over medium heat; cook and stir for 2 minutes or until thickened. Discard cinnamon stick. Stir nutmeg into syrup. Serve pancakes with warm syrup and additional butter if desired. Yield: 6 pancakes (2/3 cup syrup).