add the egg and beat well

sieve together the flour, cacao, baking powder and bicarbonate of soda

stir into the butter and mix well

turn onto a lightly floured surface and knead for 2 minutes

cover in clingfilm and put into the fridge for 15 minutes

preheat the oven to 180° Celsius

roll the dough out to 1cm high on a floured surface

cut the dough with a cookie cutter

place the biscuits onto a prepared baking sheet

bake for 8 minutes

leave to cool on the tray for 1 minute and then cool completely on a wire rack