Beat the butter and the sugar into the mixing bowl ensuring the mixture is consistent.
Add the flour (and vanilla extract if you choose to) into the mixing bowl and mix the dough thoroughly.
For the best results, refrigerate the dough for at least a couple of hours, preferably overnight.
Preheat the oven to 200°C (180°C fan/ gas 6).
Cut out shapes in the dough using your Christmas tree and snowman cookie cutters.
Place the shaped cookies onto baking tray/s keeping them at least 2 ½ cm apart.
Bake in the oven for about 12 minutes.
Check to see if the cookies are fully cooked by placing a wooden pick/ cake tester into the middle of each. If they come out clean, then you are good to go onto the next step!
Let the cookies cool in the baking tray for about 5 minutes and then transfer them to a cooling rack and leave them until they are fully cooled.