Melt the dark chocolate solids in the microwave orin a heat proof dish over a pan of simmering water

Mix the flour,cocoa, bicarbonate of soda & salt in a bowl

Cream the butter & sugars in another bowl then add the melted chocolate

Beat the vanilla extract & cold egg. then mix in the dry ingredients

Stir in the chocolate chips to this mixture

Scoop 12 equal sized mounds & place on a lined baking tray 6cms apart. Do not flatten them

Bake in a pre heated oven at 170 deg C for 18 mins

Leave to cool on the baking sheet for 4 to 5 Mins then transfer them to a cooling rack to harden as they cool