Chop peanuts. Cream butter, sugar, vanilla sugar and salt with the whisk of the hand mixer. Stir in egg. Mix flour, baking powder and cocoa, stir briefly into the fat mass. Fold in nuts and chocolate drops. Using a teaspoon, place 20 heaps (dough runs apart) on each of 2 baking trays lined with baking paper, press slightly flatter.
Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 10 minutes. Let them cool down on the baking tray. Chop the chocolate coating and melt with coconut oil over a warm water bath. Dip about 2/3 of the biscuits halfway into the couverture, drain. Place on baking paper and let dry
Waiting time approx. 1 hour