01 - Preheat oven to 400°F and line a baking sheet with parchment paper to prevent sticking and ensure even baking.
02 - Unroll thawed puff pastry sheet onto a lightly floured work surface, ensuring it lies flat without folds or creases.
03 - Spread raspberry preserves evenly across entire pastry surface, maintaining a 1/2-inch border along all edges for proper sealing.
04 - Distribute fresh raspberries uniformly over the preserves if using, pressing gently to adhere without damaging the pastry.
05 - Beginning from one long edge, roll pastry sheet tightly into a compact cylinder, applying gentle pressure to eliminate air pockets.
06 - Using a sharp knife, slice the log into 8 equal pieces approximately 1 inch thick, using a gentle sawing motion to avoid compressing the pastry.
07 - Place rolls cut-side up on prepared baking sheet, spacing 2 inches apart to allow for expansion during baking.
08 - Brush tops of each roll lightly with beaten egg using a pastry brush, ensuring complete coverage for golden coloration.
09 - Bake for 18 to 20 minutes until pastry is deeply golden, puffed, and crisp throughout, rotating tray halfway through for even browning.
10 - Allow rolls to cool on baking sheet for 5 minutes, then dust generously with powdered sugar using a fine-mesh sieve before serving warm.