Preheat oven to 350 degrees.
In a large mixing bowl, mix the butter into the mashed bananas with a wooden spoon. Mix in the sugar, egg and vanilla. Add the baking soda and salt. Add the flour and mix until just incorporated. Fold in the chopped walnuts.
Pour mixture into prepared muffin pan lined with cupcake liners. Bake 25-30 minutes until golden brown or once a toothpick inserted into the center of the muffin comes out clean. Allow to cool on a rack.
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