01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Unroll puff pastry sheet on a lightly floured work surface.
03 - Brush entire pastry surface with melted butter, then sprinkle granulated sugar evenly across the dough.
04 - Distribute chopped chocolate over pastry, maintaining a 3/4-inch border along one long edge.
05 - Roll pastry tightly from the opposite long edge into a cylinder. Seal edge with water.
06 - Cut roll into 8 equal pieces. Place spiral-side up on prepared baking sheet.
07 - Brush tops with beaten egg. Add sliced almonds if using.
08 - Bake 18–20 minutes until golden brown and puffed.
09 - Cool briefly on wire rack. Dust with powdered sugar before serving.