Whisk butter, cream cheese and egg with the whisk of the hand mixer until creamy.
Mix flour, sugar, starch, vanillin sugar, baking soda, baking powder and salt. Stir the flour mixture with the dough hooks into the cream cheese mixture.
Divide the dough into any number of pieces and colour with food colouring if desired. Colour one part brown with cocoa. Cover parts with foil and chill for at least 1 hour.
Roll walnut-sized pieces of dough into balls in your hand, roll them in icing sugar and place them with sufficient space on 5 baking trays lined with baking paper (approx. 11 pieces per tray). Press the balls slightly flat and bake in a preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: see
manufacturer) Bake for 10-12 minutes. Take out, immediately press in the sugar eyes slightly and let them cool down. Proceed in the same way with the remaining dough.