Chop 75 g dark chocolate, melt in a hot water bath and let it cool down for about 5 minutes. Coarsely chop 50 g dark and 50 g milk chocolate. Line two baking trays with baking paper. Preheat the oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see
Cream butter, 1 pinch of salt, sugar and vanilla sugar with the whisks of the mixer. First stir in the egg and then the liquid chocolate. Mix flour, baking powder and cocoa and stir in briefly.
Fold in the chopped chocolate.
Using two teaspoons of the dough, place 15 small piles on each baking tray, leaving enough space between each pile. Bake in a hot oven for 10-12 minutes one after the other.
Let it cool down.