Method
Grease a 21 cm round springform tin (with high sides) and line base with baking paper.
Beat sugar, melted butter and eggs until pale and creamy. Add the mashed bananas and beat well.
Heat the milk in the microwave until nearly boiling (approx. 1 min). Mix in the bakingsoda then stir into the banana mixture.
Add the yoghurt, flour and baking powder. Mix well and pour into the prepared cake tin. Bake for 45-50 minutes until the cake is cooked in the middle and just pulling away from the edges of the tin (insert a skewer into the centre, if it comes out clean it is cooked). Cool in tin for 5 minutes then release the sides and cool on a wire rack. When cold, swirl with icing.