Steps
1. Preheat the oven to 180°C/350°F.
2. In a bowl, combine the mayonnaise, cocoa, sugar, melted butter and egg.
3. Mix well until all ingredients are incorporated.
4. Grease a baking tin and pour the mixture into it.
5. Sprinkle the chopped chocolate over the mixture and bake for 20 minutes or until a toothpick inserted in the center comes out clean.
6. Enjoy!