01 - Preheat oven to 400°F and line a baking tray with parchment paper.
02 - Unroll the puff pastry sheet on a lightly floured surface.
03 - Evenly spread raspberry preserves over the puff pastry, leaving a 0.5-inch border on all sides.
04 - Scatter fresh raspberries evenly over the preserves, if using.
05 - Starting at a long edge, tightly roll the pastry sheet into a log.
06 - Using a sharp knife, slice the log into 8 equal pieces. Arrange rolls, cut sides up, on the prepared baking tray.
07 - Brush the tops with beaten egg using a pastry brush.
08 - Bake for 18 to 20 minutes until golden brown and puffed.
09 - Cool slightly, then dust with powdered sugar before serving.