Triple Chocolate Marble Cookies

Delicious vanilla / orange & chocolate sliced cookies, with milk, dark and white chocolate chunks. Crisp outside, soft inside. Irresistible warm from the oven!

1. 1

   If not using chocolate chips or drops, roughly chop the chocolate bars into small chunks.
   
   Sift 85 g flour, ¼ tsp bicarbonate of soda, ¼ tsp baking powder and the cocoa powder into a mixing bowl.
   
   In another mixing bowl, beat together the butter and both sugars until pale and creamy. Add the egg and vanilla extract / orange zest and beat well. Spoon half of this mixture into the other bowl, and sift the other 115 g flour, ¼ tsp bicarbonate of soda and ¼ tsp baking powder into the remaining mixture.
   
   Add the milk chocolate to the vanilla / orange dough and the dark and white chocolate to the chocolate dough, and stir. Bring each mixture together into a dough with your hands.
   
   Lightly dust the worktop with a little flour and turn out the chocolate dough and roll it into a slim sausage shape, about 40cm in length, then cut it in half. Do the same with the vanilla dough, then twist one of the chocolate sausages around a vanilla one and roll into a log shape. For small cookies, cut in half and roll into 2 thin logs about 20cm long, for large ones, keep as a fatter 20cm log. Repeat with the remaining dough, then wrap each log tightly in cling film. Chill in the fridge for two hours or longer (can be left overnight).
   
   When you are ready to bake the cookies, preheat the oven to 200 degrees C. Line one or two baking tray(s) with baking paper or a silicone mat. Remove the logs from the freezer or fridge and unwrap. With a sharp knife, slice into rounds about 2cm thick. Put the sliced cookies on the lined baking tray(s), leaving at least 5cm between each one to allow them to spread. Just cut as many as you want to bake per batch, as the logs can be kept in the fridge for a week, and sliced when needed. Alternatively, freeze for up to a month.
   
   Bake the cookies for 10 minutes (or 12-14 minutes if slicing and baking from frozen). Remove from the oven and leave to cool on the baking trays for at least 5 minutes, to firm up, then transfer them to a wire rack to cool completely (or eat a few while warm and squidgy!).