Roughly chop the chocolate, melt it in a hot water bath and let it cool down a little. Roughly chop the caramel bars. Cream butter, sugar, vanilla sugar and 1 pinch of salt with the whisk of the mixer.
First stir in the egg, then the melted chocolate. Mix flour, baking powder and cocoa and stir into the butter-chocolate mixture. Approx. 2⁄3 add the caramel bar to the dough.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Line two baking trays with baking paper. Using a tablespoon, place 8 large heaps of each on the baking trays at a distance and press them slightly flatter.
Sprinkle the remaining caramel pieces on top, press lightly.
Bake cookies one after the other in a hot oven for about 10 minutes. Let them cool down on the baking tray for about 5 minutes, then take them down and let them cool down completely on a cake rack.