grease and line a 2 lb loaf tin, melt butter , sugar and vanilla in a saucepan over a medium heat

remove from heat and add the mashed bananas, and mix well.

add the egg and mix well

stir in flour and milk

pour into prepared tin, sprinkle with a tablespoon of demerara sugar to give a crunchy topping if liked

bake at 150 c fan oven (or 170 c regular, gas mark 3 for 35 mins, until a skewer comes out clean. leave to cool and enjoy