Dump all dry ingredients (almond flour, arrowroot powder, baking powder and salt) into the food processor and pulse a few times to mix.
Add maple syrup and vanilla to food processor.
Process on low speed until everything forms a smooth ball. It should take a minute or so. Dough will be smooth but very sticky. It should have the consistency of marzipan.
Put dough in a gallon-size plastic bag and seal. (Using the plastic bag allows you to work with the dough without it sticking to everything.)
Using a rolling pin, roll the dough out smooth until it fills nearly the entire bag. It should be about ⅛-¼ thick.
Place bag in the freezer on a flat surface and freeze for 15 minutes.
Grease a glass baking dish.
Remove dough from freezer and immediately rip the bag down the sides to open all the way.
Press (dough side down) the dough into the pie plate. Remove the plastic bag. It should be easy to remove because the dough is still mostly frozen.
Shape the edges of your pie crust to make it look pretty.
Fill the pie and bake according to pie instructions.