01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Unfold puff pastry on a lightly floured surface. Spread raspberry preserves evenly, maintaining a 1/2-inch border along edges. Distribute fresh raspberries over preserves if using.
03 - Starting from one long edge, roll pastry tightly into a uniform log. Slice crosswise into 8 equal portions.
04 - Place rolls cut-side up on prepared baking sheet. Brush tops generously with beaten egg.
05 - Bake for 18-20 minutes until pastry is puffed, golden-brown, and fully cooked through.
06 - Cool on baking sheet for 5 minutes. Dust generously with powdered sugar immediately before serving warm.