Mix cake mix, eggs, sour cream, butter, vanilla, cinnamon, and Peach Jello on medium speed until well mixed; about two minutes. Spread in 9 x 13" greased and floured baking dish and then line sliced peaches to cover top. Sprinkle nutmeg over top of peaches and bake 35 - 40 minutes. Sprinkle with powdered sugar if desired. Serve with vanilla ice cream. YUMMO!