Yogurt
Melt dark chocolate and butter using a double boiler.
Add sugar to the melted chocolate and mix well.
Add eggs one at a time, mixing thoroughly after each addition.
Sift in flour and cocoa powder, then mix to combine.
Pour the batter into a pan.
Bake in a preheated oven at 170°C (338°F) for 25 minutes.
Let it cool, then cut into desired sizes.