Heat oven to 375 degrees F. Butter a 13 x 9-inch baking dish. Pour peaches and juice into dish. Pour cake mix evenly on top of fruit layer. Gently press down cake mix so that it soaks into the peach juice, but do not stir. It is very important to make sure all the cake mix is pressed into the juice, or it will not get "cakey," but stay "powdery." Drizzle melted butter across cake mix. Dust top with a mixture of sugar, cinnamon and nutmeg. Drag knife through mixture to gently combine. Bake for about 50 - 60 minutes or until crust is golden brown. Serve warm with ice cream or whipped cream.