Preheat your oven to 400°F.
Line your baking sheet with parchment paper.
Mix sugar and cinnamon in a bowl.
Set everything aside and get ready.
Unfold your thawed puff pastry sheet.
Sprinkle cinnamon sugar on your work surface.
Place pastry on top of the sugar.
Brush melted butter over the pastry completely.
Sprinkle more cinnamon sugar on top generously.
Roll both long sides toward the center.
They should meet in the middle perfectly.
Press them together gently but firmly.
Wrap in plastic and refrigerate 30 minutes.
Cut the roll into half-inch slices.
Place them on your prepared baking sheet.
Leave space between each piece for expansion.
Bake for 15-18 minutes until golden.
Flip halfway through for even browning.
Let them cool on the sheet.
They'll become crispier as they cool down.
Serve warm or at room temperature.