Cut the caramel sweets in half crosswise. Cream butter, peanut butter, sugar and vanilla sugar with the whisk of the mixer. Add the egg and stir in for about 1 minute. Mix flour and baking powder and knead with the dough hooks of the mixer.
Knead the peanuts.
Preheat oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer). Line two baking trays with baking paper. Form approx. 12 balls from the dough, fill each with 1⁄2 candy. Place 6 piles of dough on each baking tray, press them slightly flatter and bring them into a round shape.
Bake the trays one after the other in a hot oven for about 10 minutes each. Let the cookies cool down on the tray.