Break the chocolate into pieces and melt in a hot water bath. Let it cool down a little. For the basic dough, whisk butter, sugar, vanilla sugar and 1 pinch of salt for 7-8 minutes until creamy.
Stir in the eggs. Mix flour and baking soda, stir in briefly.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Line a baking tray with baking paper. Halve the dough. Stir peanut butter into one half, cocoa, liquid chocolate and nuts into the other half.
Using a tablespoon, place approx. 6 small piles of dough on the baking tray with a large gap between them and press them slightly flat. Put the rest of the dough aside.
Bake in a hot oven for about 12 minutes. Then let it cool down on the tray for about 5 minutes. Pull the cookies from the baking tray together with the baking paper and let them cool down completely. Spread the remaining dough on 3-4 more trays and bake in the same way.