Line two baking trays with baking paper. Preheat the oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer). Cream butter, peanut cream, sugar and 1 pinch of salt with the whisks of the mixer. Mix flour and baking powder. Stir in briefly. Portion the dough with an ice cream scoop. If the dough is still in the scoop, add a few drops of chocolate in the middle.
Place the balls at a distance on the trays, carefully place them on each 3-5 chocolate drops and press them down. Bake in a hot oven for 13-15 minutes one after the other. Take them out and let them cool down on a cake rack.
Break the chocolate into pieces, melt in a hot water bath and fill into the piping bag. Cut off a very small corner, squirt 8 spider legs on each chocolate droplet, let dry.