Pour the prepared mixture in the large baking tray, covered with baking paper, and distribute it out evenly.
Bake at 356°F (180 °C) for 15-20 min., depending on the oven.
While still warm, smear it evenly with marmalade and roll it up into a tight a roll as possible.
Cover with the baking paper and leave to cool briefly.
Before serving, sprinkle with powdered sugar.