Preheat oven to 180C/350F.
Grease the tin with soft butter (or line with baking paper).
Break the eggs into a mixing bowl. Add the melted butter, sugar, flour and mashed bananas.
Mix very well either by hand or using an electric mixer.
Spoon into the tin, smoothing out with the back of the spoon.
Bake for 40 - 50 mins at 180C/350F until it is golden on top and a knife or skewer comes out clean.
Allow to cool in the tin for 10 - 15 minutes and then turn out carefully.
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