Thaw pastry shell. Preheat oven to 425°F.
Mix together coconut sugar, flour, arrowroot powder, and water in a medium bowl. Stir in apple slices. Pour into bottom of pie crust. Sprinkle with cinnamon, nutmeg, and allspice.
To prepare the topping, mix together the flour, coconut sugar, and nuts. Cut in the butter and coconut oil to make a crumbly mixture. Sprinkle crumbs on top of pie filling and spices.
Bake at 425°F for 10 minutes. Reduce heat to 350°F and continue baking for 25-30 minutes, until crumbs and crust are golden brown on top. Serve warm and enjoy!