1. Cream margarine and sugar until light and fluffy, beat in eggs until combined.
2. Stir in banana. Stir in half the sifted dry ingredients and combine. Add remaining flour and milk, stir until smooth.
3. Pour mixture into greased 20cm, round cake tin. Bake at 180ºC (350ºF) for 30 minutes.
4. Stand for 5 minutes before turning on to wire rack to cool.
5. To make icing beat icing sugar with enough orange juice to make a firm mixture, beat in cream cheese. Spread over cake and decorate with orange rind.

Suggestion: Serve with low fat ice cream for a tempting dessert.