Place the butter, caster sugar and vanilla extract into your Thermomix bowl and mix for 30 seconds, speed 3.
Scrape down the sides of the bowl and mix for a further 20 seconds, speed 3 until the mixture is pale and creamy.
Add the flour, egg and extra egg yolk and and mix for 10 seconds, speed 4.
Scrape down the sides of the bowl and select the ‘kneading’ function and knead for 2 minutes.
Turn the dough out onto a bench which as been dusted with flour or a Thermomat and lightly knead to bring it into a ball and wrap in cling wrap. Pop it into the fridge for 30 mins to chill.
Preheat your oven to 180 degrees celsius and roll out dough (to a thickness of 5mm) between two sheets of baking paper. Use an 10cm biscuit cutter before using the 4cm cutter in the centre to make the ‘wreath’. Use a skewer to make a small hole in the top of the dough (this is where you will thread the ribbon through) and use an egg flip to carefully transfer the biscuit onto your prepared baking tray. Repeat until you have used all of the dough.
Bake in oven for 10-12 minutes or until the biscuits begin to turn golden around the edges. Leave the biscuits to cool on the trays for 10 minutes before carefully transferring to a wire rack to cool completely
Once completely cool, cut a small piece of the ribbon and thread it through the hole you made in the top of the biscuit (if it has closed a little during baking you can use the skewer to carefully make it bigger) and use the icing and decorations to decorate your Christmas Wreath Biscuits as desired.