01 - Set the oven to 400°F. Line two baking sheets with parchment paper.
02 - In a small bowl, thoroughly blend sugar, cinnamon, and optional salt.
03 - Evenly sprinkle half of the cinnamon sugar blend over the workspace. Place the puff pastry sheet on top.
04 - Sprinkle the remaining cinnamon sugar evenly over the pastry. Using a rolling pin, gently roll into a 10 by 12-inch rectangle, pressing the cinnamon sugar into the dough.
05 - Roll the pastry tightly from one long edge toward the center, then repeat from the opposite edge so the two rolls meet in the middle, creating a double spiral.
06 - Using a sharp knife, slice the roll crosswise into 1/2-inch thick pieces, yielding approximately 24 slices.
07 - Place the slices cut side up on prepared baking sheets with ample spacing. Lightly sprinkle with additional granulated sugar.
08 - Bake for 8 to 10 minutes, then carefully flip each piece and continue baking for an additional 7 to 8 minutes, until golden and caramelized.
09 - Allow to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.