Mix flour, cocoa, baking powder, 150 g sugar, salt. Knead with egg and milk with a hand mixer until smooth. Cover and chill for about 2 hours
Mix butter, cream cheese, 60 g sugar, vanillin sugar, grated coconut and hazelnuts. Roll out the kneading dough between 2 layers of foil to a plate (approx. 20 x 30 cm). Spread the cheese cream on top and roll up from the long side. Wrap in foil. Keep cool overnight
Cut dough roll into approx. 1/2 cm thick slices, place on baking trays lined with baking paper. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 8 minutes. Let them cool down