Preheat oven to 400F.
Line a baking sheet with parchment paper or a silicone baking mat.
Unroll the dough on a cutting board.
Use fall-themed cookie cutters to cut out pie cookie shapes from the unrolled dough.
Place the pie crust cookies on the prepared baking tray.
Beat together the egg and milk, then brush the egg mixture over all cookies.
Stir together the cinnamon and sugar and sprinkle over all cookies.
Bake for 6-8 minutes until just lightly golden.