Mix butter and icing sugar well until the mixture goes pale. Add in the vanilla extract and mix them well.
Add in the egg.
Add the sieved flour and mix well.
Divide the dough into three small doughs.
Add Nutella in one dough and mix them well; add coco powder in another dough.
Use the cling film to wrap the doughs and leave them in the fridge to chill for 20-30 minutes..
Divide the doughs into small balls (4g/ ball).
Take two balls from each colour and place them as shown in the picture. And then push all the balls together a bit.
Put the dough in the palm and roll it in ONE direction (clockwise or anti-clockwise)
Place the dough on a baking paper and gently press the dough. Bake in a 170C oven for 15-18 minutes. Leave them on the baking tray for 5 minutes after moving out from the oven and then put them on a rack to cool. Enjoy!!
