Preheat oven to 450℉. Line several baking sheets with parchment paper or silicone baking mats.
In a small bowl, combine cinnamon and sugar.
Sprinkle ½ of the cinnamon sugar on a clean work surface. Place a sheet of puff pastry on top of the cinnamon sugar, then sprinkle about ¼ cup of cinnamon sugar on top. Roll out to a 13 inch square, pressing the cinnamon sugar into both sides.
Fold one side of the pastry in ¼ of the way. Then fold again to the halfway point. Repeat on the other side. Fold both sides together, like a book.
Slice in ⅜ inch slices with a sharp knife and place cut side up on a prepared baking sheet leaving 3 inches between.
Bake at 450℉ for 6 minutes until caramelized and brown on the bottom . Flip cookies over and bake for another 3-5 minutes until the other side is caramelized.