For the chocolate kisses, melt the chocolate with butter over steam and then let cool slightly.
Sift the baking powder into the flour and mix with cinnamon and cocoa. Slowly stir the sugar into the chocolate. Finally, add the egg yolks. Knead the dough together with the flour mixture. Leave to rest for two hours in a cool place.
Preheat the oven to 160 ºC hot air.
Form small balls from the dough. Flatten slightly and place on a baking tray lined with baking paper. Bake for about 12 minutes.
Then sprinkle the chocolate kisses with powdered sugar or decorate with a little jam and hail sugar or pistachios.