4 very ripe bananas, mashed
1 tsp baking powder
75g/2戮oz soft light brown or light muscovado sugar
陆 tsp ground cinnamon
1 tbsp demerara sugar
4 tbsp agave or maple syrup
50驳/1戮辞锄 raisins
125驳/4陆辞锄 self-raising flour
125ml/4fl oz sunflower oil
1 tsp vanilla extract
25g/1oz chopped walnuts
125驳/4陆辞锄 self-raising wholemeal flour
3 free-range eggs, beaten
100ml/3陆fl oz low-fat natural yoghurt