Preheat oven at 160c.
Lined 20cm square tin with baking paper
1. Chop Butter & Chocolate for 5 sec on speed 5, (scrape down the side)
2. Melt Butter & Chocolate 2mins 60c on speed 1,
3. Add eggs, sugar & vanilla essence, mix for 5 sec on speed 3 or 4,
4. Add flour & coco and mix for 5 sec on speed 3 or 4,
5. Pour mixture into a lined tin and bake it for 40-50mins