To make the dough cream together the butter and caster sugar. Add the egg and vanilla extract and mix well
Add the plain flour, cinnamon and baking powder and mix to form a dough. Wrap it in cling film and chill it in the fridge for 1 hour
Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4, line your baking tray(s) with baking paper
Roll the dough out onto baking paper, and cut out using a 2.5" round biscuit cutter (or snowflake shaped cutters if you prefer)
Bake them for 8 - 10 minutes, until they are just going golden at the edges. Leave to cool completely
Decorate however you like. I made a thick icing from icing sugar and water and piped snowflake patterns on some of the biscuits. For the others, I cut out snowflake shapes from blue fondant and stuck them onto the biscuits with edible glue. I also sprayed on some edible silver glitter
Store in an airtight container and eat within 5 days