Preheat the oven to 400° F.
Add the walnut pieces, dates, and raisins to a high speed food processor.
Process until a sticky date crust forms.
Press the date crust mixture into ten cavities of a lined and greased mini cupcake pan.
Add the oat flour, coconut sugar, baking powder, cinnamon, and pumpkin pie spice to a large mixing bowl.
Mix all dry ingredients well to combine.
Make a well in the center of the bowl and add the canned pumpkin, pure maple syrup, and nut milk.
Mix again to form a smooth pumpkin pie filling.
Evenly distribute the pumpkin pie filling on top of the ten mini pumpkin pie crusts.
Pop the mini pumpkin pies in the oven to bake for about 15 - 20 minutes, or until a toothpick inserted comes out mostly clean.
Let the mini pumpkin pies cool completely before removing them from the pan.
Dig in and enjoy!