01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - On a lightly floured surface, roll out the puff pastry to a rectangle approximately 12x10 inches.
03 - Cut the pastry into 8 equal rectangles.
04 - Place a portion of chocolate along the short end of each rectangle. Roll up tightly, sealing the seam underneath.
05 - Place pastries seam-side down on the prepared baking sheet, spacing them apart.
06 - Brush each pastry with beaten egg for a golden finish. If using, sprinkle sliced almonds on top.
07 - Bake for 18–20 minutes, or until puffed and golden brown.
08 - Cool slightly on a wire rack. Dust with powdered sugar before serving if desired.