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1
Combine mashed bananas, melted butter, and sugar in large bowl; mix until sugar dissolves.
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2
Stir in beaten egg and vanilla extract.
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3
Whisk flour, baking soda, and salt in separate bowl; alternate folding flour mixture and buttermilk into wet ingredients, beginning and ending with flour.
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4
Fold in walnuts; pour into parchment-lined loaf tin.
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5
Bake at 175°C for 55–60 minutes until skewer inserted in centre emerges clean.
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6
Cool in tin 10 minutes; invert onto wire rack and cool completely.