Work with butter and sugar cream in a bowl. Add egg and vanilla and mix, then add flour, yeast and salt and work until you get a smooth dough.

Wrap the dough pastry with the plastic wrap and let it rest in the fridge for at least 30 minutes.

Pick up the pastry and roll it out in a 3-4 mm sheet on the floured work surface or covered with parchment paper, then cut the biscuits with a round shape with a diameter of about 8 cm.

Place the biscuits on a baking sheet lined with parchment paper and bake at 180 ° C in a preheated oven for 10-12 minutes or until the edges are golden. Once baked, let it cool.

Now prepare the frosting by working the mascarpone well with the icing sugar until you get a cream.

Roll out the sugar paste into a thin sheet, then make circles with the same form used to create the biscuits. Then cut each circle of sugar paste in half.

Cover the biscuits with a thin layer of half mascarpone frosting: use it to attach the sugar paste caps.
Then create with the frosting mascarpone, which you have put in a sac a poche with a small star spout, the decorations of the hat and the tufts of beard

Complete the decoration by adding 2 drops of chocolate to make the eyes (always use a little 'frosting to attach) and a ball of sugar paste for the nose.
Your Santa Claus cookies are ready: serve them and amaze your children!