Cream the butter and sugar together until light and fluffy.
Beat in the eggs, one by one along with the vanilla extract if using.
Work in the flour until it all comes together.
Divide the mixture into three.
Add the cocoa powder to one batch and the matcha to another and work that into the dough.
Cover each one and leave to chill in a cool place for half an hour or so.
Roll the doughs out to about the thickness of a £1 coin and cut out circles that are big enough to allow for your chosen shape to be taken from the middle. I used a 7 cm diameter cutter for the stars and a 8 cm diameter cutter for the Christmas trees.
Place the biscuits on lined baking sheets, then cut our stars, Christmas trees or whatever else you fancy from the middle of the biscuits.
Transfer the vanilla cut outs into the equivalent shaped holes in the matcha and chocolate biscuits and do the same with the others so each biscuit has a different coloured and flavoured centre.
Bake at 180℃ (350℉, Gas 4) for about 12 minutes or until the biscuits are just starting to change colour.
Adapted from Christmas Tree Cookies by Kerry CooksPlease note: calories and other nutritional information are per serving. They're approximate and will depend on serving size and exact ingredients used.