Cream the butter and sugar until light and fluffy. Add eggs one at a time, beating well after each addition. Add bananas one at a time, again beating well after each addition. Stir baking soda into hot milk and add to mixture. Sift flour and baking powder into mixture and fold. Place mixture into a 20cm greased cake tin and bake at 180˚C for 50 minutes or until the cake springs back when lightly touched (or until you can insert and then remove a skewer cleanly). Leave cake in the tin for 10-15 mins before turning it out on to a cooling rack.
Banana cake is best served with chocolate or cream cheese icing. Enjoy!