Preheat the oven to 375 degrees F. Line the baking sheet with parchment paper, set it aside.
Place oat flour, tapioca starch, potato starch, cane sugar, ground flaxseeds, baking powder, salt, xanthan gum in a large bowl and mix.
Add the vegan butter and knead to form dough into the consistency of breadcrumbs.
Add almond milk and knead to form a smooth dough ball.
Divide the dough into 6 pieces and roll into 6 balls. Roll out each ball between two sheets of parchment paper, about 4 inches long and ⅛ inch thickness.
Remove the top parchment paper. Add about 1 tablespoon of the cooled apple pie filling in the center of each rolled-out dough. Fold over the dough halfway to cover the filling.
Press the edge of the hand pie with the tines of a fork to seal. Cut slits in on top of the pies to allow the steam to escape and transfer to the prepared baking sheet.
Repeat until all the hand pies are made. Then, place in a single layer on a baking sheet and bake for about 30 minutes.