Preheat oven to 450°F and adjust rack to middle position. Place the maple sugar, arrowroot, cinnamon, nutmeg, pumpkin, eggs and milks in a blender. Blend until smooth. Pour filling evenly into unbaked pie shells. Place pie dishes on a large baking sheet. Cover crust with a pie shield or foil to ensure the crust doesn’t burn. Bake at 450°F for 15 minutes. Turn oven down to 350°F and bake for an additional 20 minutes until edges of pie are set. Cool to room temperature before serving. Serve alone or with whipped cream.