Start by sprinkling powdered sugar on your countertop.
Unroll your thawed puff pastry and dust it with more powdered sugar.
Use a rolling pin to flatten the pastry --- dust the rolling pin with powdered sugar as well.
Sprinkle cinnamon powder.
Use a brush to distribute the cinnamon powder evenly.
Roll puff pastry (starting on the long side) and wrap it with plastic.
Freeze for 30 minutes, then preheat your oven to 180°C (350°F).
Take the wrapped roll of pastry out of the freezer.
Use a serrated knife to cut the rolled puff pastry into portions --- about 1/2-inch each piece.
Use a rolling pin to roll each portion into thinner portions.
Use only forward and backward rolling; the cookie dough would not be a perfect circle at this point --- dust with more powdered sugar.
Place each rolled cookie dough on a tray lined with parchment paper.
Make sure you keep some spaces in between.
Cover the cookies with another baking sheet.
Place another tray on top of the cookies to prevent the dough from puffing too much when cooked.
Place the tray in the oven for 23 to 25 minutes, or until the cookies are brown or golden.
Set your puff pastry cookies aside to cool.
Sprinkle with more powdered sugar or cinnamon, if desired --- serve!