Line two baking trays with baking paper. Knead flour, cocoa, baking powder, sugar, 1 pinch of salt, butter in flakes, egg and liqueur first with the dough hooks of the hand mixer and then briefly with your hands until smooth.
Knead in 50 g chocolate drops.
Form 2 rolls (each approx. 4 cm Ø) from the dough and cut into approx. 22 slices each. Place on the baking trays. Spread 25 g chocolate drops on top and press lightly into the dough. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 8 minutes.
Let it cool down.