01 - Heat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Lightly flour a surface and roll the puff pastry into a 12 × 10 inch rectangle.
03 - Cut the pastry into 8 equal rectangles.
04 - Place approximately 0.4 oz of chocolate along the short edge of each rectangle. Roll tightly, sealing the seam underneath.
05 - Place pastries seam-side down on the prepared sheet, spacing evenly.
06 - Brush each pastry with beaten egg. If desired, sprinkle sliced almonds on top.
07 - Bake for 18 to 20 minutes until puffed and golden brown.
08 - Allow pastries to cool slightly on a wire rack. Dust with powdered sugar before serving if preferred.