1. Preheat your oven to 350°F or 175°C.

2. Line a baking sheet with parchment paper and set it aside for later use.

3. On a lightly floured surface roll out the butter dough to a thickness of about 1/8 inch or 3 mm.

4. In a small bowl whisk the egg until it's smooth then set it aside.

5. Spread the warm Nutella evenly over the dough making sure to leave a 1-inch or 2.5 cm border around the edges.

6. Sprinkle the chopped almonds over the Nutella layer.

7. Brush the edges of the dough with the whisked egg to help with sealing.

8. Roll the dough into a tight log starting from one of the long sides and applying gentle pressure.

9. Place the log seam-side down on the prepared baking sheet to prevent it from opening during baking.

10. Brush the top of the log with the remaining egg for a golden glaze.

11. Bake in the preheated oven for 25-30 minutes or until the log is golden brown.

12. Let it cool completely before slicing and serving.