Mix butter until creamy with an electric mixer or with hand.
Add in sugar and egg yolks to the butter. Mix the mixture until light und fluffy.
Sieve in the all purpose flour slowly and mix everything together until it forms a dough.
Transfer dough onto working top and knead dough until smooth and non-sticky.
Wrap the dough with a cling wrap and put the dough in the refrigerator for at least 30 minutes.
Take out the dough and cut the dough into 3 parts. It is easier to work on small parts of dough. Preheat oven to 210°C.
Spread some flour onto the working top and a rolling pin. Roll out dough about 3 mm thick.
Cut dough with Christmas themed cookie cutters and place cookies on a baking tray with a parchment paper lined.
Beat 1 egg yolk and coat egg yolk on each cookie.
Bake cookies for roughly 8.5 mins – 10 min or when cookies slightly turn brown.
Take the cookies out from oven and let it cool down completely.
Store cooled cookies in an airtight container in a cool place. You can store the cookies up till 1 month.