Pre heat oven 180C . Grease a 20 cm round cake tin and line base with baking paper.
Cream butter and sugar till light and fluffy. Add eggs one at a time, mix well.
Add mashed banana and mix thoroughly.
Stir baking soda into hot milk and add to creamed mixture.
Sift flour & baking powder, fold into mix.
Turn into prepared tin.
Bake for 50 minutes or until cake springs back when lightly touched.
Leave in tin for 10 minutes before turning out onto a cake rack. .
When cold ice with what ever flavoured icing you want, or whip up cream and add sliced banana.