Thaw puff pastry sheet per directions on the back of the box. Preheat oven to 400°F.
Line a sheet tray with parchment paper, place thawed pastry directly on the sheet tray. Cut braid per tutorial.*
In two long rows, side by side, spoon the cranberry sauce and marmalade down the center of the braid. Fold braid per the tutorial.
In a small bowl, beat the egg with a splash of cold water. Brush all over the pastry. Sprinkle with the decorator’s sugar. Bake for 20-25 minutes until golden brown. Let cool slightly.
In a small bowl, whisk together the powdered sugar and milk. Pour the glaze over the braid, cut and serve.