1. Sift the flour, baking powder & maizena.
2. Mix cocoa in boiling water, add oil, and yogurt, and set aside.
3. Beat egg whites until you have stiff peaks.
4. Add salt and beat again.
5. Add castor sugar carefully in 4 batches & beat well until sugar is dissolved.
6. Continue to beat until thick & creamy.
7. Add vanilla & yolks to the cocoa water and beat well.
8. Add to the egg white mixture and beat well.
9. Lastly fold the flour into the egg mixture making sure you don’t overbeat the mixture, fold in carefully.
10. Pour into a well prepared baking sheet pans (43×30cm) pan and bake @ 180°C / 350F for 15-17 minutes
11. Turn out onto a cloth which you sprinkled with a layer of castor sugar.
12. Leave to cool then cut it in the center lengthwise.
13. Beat 500ml fresh cream with 2 Tblsp castor sugar.
14. Spread Nutella on one half of the cake.
15. Spread ½ of the cream on the Nutella then stack the other piece of cake one on top & spread the rest of the cream on the top layer
16. Drizzle with chocolate ganache

Ganache

1. Melt the Cadbury plain Chocolate and add about ½ a can of Nèsle cream.
2. Mix well to a thick ganache

Crush enough Oreo biscuits to cover the top generously then decorate with chocolate swirls.