Preheat oven to 350°F (175C).

Mash bananas in a bowl

Melt butter and add to bananas

Next, mix in the sugar, egg and vanilla

Sprinkle the baking soda and salt over the mixture, and mix in

Lastly, add the flour

Pour mixture into a buttered 4x8 inch loaf pan

Bake for 1 hour

Cool, remove from the pan, and slice to serve