1 Pre heat the oven to 190C/Gas Mark 5.
2 Put the butter and sugar into a bowl and beat them together until the mixture is soft and creamy. Beat the egg, add it to the bowl and mix it all together.
3 Add the flour, cocoa powder and bicarbonate of soda and beat again until it’s a sticky dough. Add the fillings – three tablespoons worth in all (the kids can choose how they want to make their own recipe).
4 Add a little flour to your hands and take about half a teaspoon of the mixture and roll it into a round ball. Lay these shapes onto 2 greased baking trays, making sure they’re spaced well apart as the cookies will spread out about 3 times their size.
5 Bake for 12 minutes, then remove from oven and leave to cool. Store them in a cookie tin and they should last up to 3 weeks.