01 - Preheat oven to 400°F (200°C) and line a baking tray with parchment paper.
02 - Unroll the puff pastry sheet on a lightly floured surface.
03 - Spread raspberry preserves evenly over puff pastry, leaving a half-inch border along the edges.
04 - Scatter fresh raspberries evenly over the preserves, if using.
05 - Starting from a long edge, roll the pastry tightly into a log. Slice the log evenly into 8 pieces.
06 - Arrange the pastry slices, cut side up, on the prepared baking tray and brush tops with beaten egg.
07 - Bake for 18 to 20 minutes, or until rolls are golden and puffed.
08 - Allow pastry rolls to cool slightly, then dust with powdered sugar before serving.