Preheat the oven to 350 degrees F. Combine the first seven ingredients in bowl, and then set aside. In another bowl, mix together sugar, flour, baking powder and salt. Stir in the milk until just incorporated. Place the melted butter in an 8x8 pan. Pour the batter over melted butter. Spoon the apple mixture over batter. Bake 40-45 minutes, or until toothpick inserted in the centre comes out clean. Serve warm with, if desired, vanilla ice cream or lightly whipped cream.