Heat the cream to lukewarm. Beat butter and icing sugar until fluffy. Add egg yolks, vanillin sugar and salt. Add the cream gradually, then the flour. Pour the dough into a piping bag with a small (6 mm Ø) punched spout.
Spray approx. 50 small, round snails (approx. 5 cm Ø) onto two baking trays lined with baking paper. Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 8-10 minutes, remove and let cool. Cover half of the biscuits with icing and decorate them with decorative lettering. Spray decoration cream on the second half of the cookies and cover with the decorated cookies