Preheat oven to 400°
Combine the diced apples with the apple butter and set aside.
On a lightly floured surface, unfold puff pastry sheets and gently press out to flatten. Cut each sheet into four even pieces.
Place two heaping spoonfuls of the apple mixture onto one of the cut puff pastry pieces, towards the bottom half but still leaving enough space around the edges (about a ½ inch) to seal them.
Dab your finger in water and gently go around the edges, then fold the top half over the bottom half.
Grab a fork and press down the edges to seal them shut.
Repeat until all puff pastry sheets have been filled and transfer each of them to a baking sheet lined with parchment paper.
Brush the top of each hand pie with a generous amount of vegan butter.
In a small bowl mix together the cinnamon and sugar. Use a spoon to sprinkle the mixture over top of each of the hand pies, then transfer to the oven to bake for 20-23 minutes or until golden brown.
While the hand pies are baking, combine the ingredients to make the cinnamon icing by whisking everything together.
Once the hand pies are done baking, remove them from the oven and let cool for a few minutes.
Once cooled, drizzle with the cinnamon icing and enjoy!