Put flour, fat, sugar, vanillin sugar, egg and salt in a bowl. Knead with the dough hooks of the hand mixer to a smooth dough. Shape into a ball with cool hands and cover and refrigerate for approx. 30 minutes.
Roll out the dough on a floured work surface to a thickness of 3-4 mm. Cut out 12 thalers (7 cm Ø), crescents and stars. Knead the dough again, roll out and cut out cookies. Place on a baking tray lined with baking paper.
Bake in the preheated oven (electric: 175 °C/ gas: level 2) for about 10 minutes. Mix icing sugar and egg liqueur. Spread crescents and stars with it. For the filling, pour milk, cream and cream powder into a mixing bowl.
Mix with the whisk of the hand mixer. Whip for 3 minutes at highest setting until creamy. Chill for 15 minutes. Pour into a piping bag with star-shaped spout and squirt onto the thalers. Refrigerate for another 15 minutes.
Before serving, decorate with a crescent moon and star. Makes 12 cupcakes.