1. The first step is preheating the oven to 180° C. Grease and flour a cake pan and set aside.
2. In a bowl, cream the margarine, sugar and vanilla.
3. Add in eggs one at a time until combined.
4. Beat in yoghurt until just combined.
5. Combine in a separate bowl the flour, bicarbonate of soda and cocoa powder.
6. Fold wet mixture into dry mixture gently.
7. Pour into cake pan and bake for 40-45 minute.
8. Leave to cool in pan for 10 minutes and then turn out onto cooling rack.
9. Icing
10. In a bowl, combine all ingredients and beat until smooth.
11. The last step is Pour onto the top of the cake and smooth over with a palate knife.