Pre-heat oven to 180c, line a rectangle baking tray with baking paper and spray.

Melt dark chocolate and butter together.

Sift chocolate powder, flour, baking powder together then add sugar.

Beat eggs and sour cream together.

Combine all ingredients. If you're feeling adventurous, now is the time to add fun nuts like macadamias or hazelnuts, iwth a pinch of salt.

Bake at 180c for 1 hour. Yield is 20-24 pieces