Preheat the oven to 180°C.
Cut both types of chocolate into small chunks. Mix the softened butter with the sugar so that you have a smooth and creamy mixture. Add the flour and baking powder. Mix in the egg. Add the chocolate chunks and stir in.
Use a spoon to place small balls of cookie dough on a baking tray. Flatten slightly with the palm of your hand. Chill in the fridge for 10 minutes.
Transfer the cookies to the oven and cook for 10 to 12 minutes so that the cookies are lightly browned.
«Leave a good amount of small between the cookies when you place them on the baking tray as they will spread out a little during the cooking process.»