1. Mix the egg whites and icing sugar until smooth.
2. Add the almond powder and cocoa and mix until a homogenous dough is formed.
3. Put the dough between 2 pieces of baking paper and roll out until it is between 1-2mm thick.
4. Cut with a cookie cutter and place on a baking tray.
5. Paint tops of cookies with egg and then sprinkle brown sugar over the top.
6. Bake for 4 minutes at 200º. Remove from oven and allow to cool.

These cookies are soft in the middle which is why they are cooked at a high temperature for such a short time. This allows the outside to go crunchy and the middle to stay soft.