Prepare: Preheat your oven to 375°F (190°C) and line a baking tray with parchment paper. Roll out the thawed puff pastry onto a lightly floured surface.
Spread: Evenly spread the Biscoff cookie butter over exactly one half of the puff pastry sheet.
Sprinkle: Mix the brown sugar and cinnamon together in a small bowl, then sprinkle it evenly over the Biscoff layer.
Fold & Chill: Fold the blank half of the pastry over the Biscoff side to sandwich the filling. (Pro tip: Place the folded dough in the freezer for 5-10 minutes to firm up before cutting).
Cut & Twist: Cut the dough into 8 even strips. Twist each strip a few times, then roll it tightly around itself to create a swirl shape.
Bake: Place the swirls on the prepared baking tray. Lightly brush the tops with melted vegan butter. Bake for 15-20 minutes, or until deeply golden brown and puffy.
Serve: Allow the swirls to cool slightly before serving warm. Enjoy!