In a bowl, whisk 2-3 minutes egg, brown sugar, vanilla sugar and salt until it reaches a creamy consistency.
Add the fat and milk and mix briefly. Mix flour, baking powder, cocoa and lebkuchengewürz (Gingerbread spice lebkuchen spice) and sift into the dough.
Add coarsely crushed hazelnuts on top and mix everything briefly. Distribute the dough into muffin molds. Bake the muffins in a preheated 170 degrees oven on top and bottom setting for approximately 20 minutes.
Melt the couverture using the bain-marie method and coat the muffins. Sprinkle crushed hazelnuts on top. Wait until the chocolate sets and serve!.