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Preheat the oven to 350°F.
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With a wooden spoon, mix butter into the mashed bananas in a large mixing bowl.
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Mix in the sugar, egg, and vanilla.
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Sprinkle the baking soda and salt over the mixture and mix in.
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Add the flour last, mix.
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Pour mixture into a buttered 4x8 inch loaf pan.
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Bake for 1 hour.
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Cool on a rack.
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Remove from pan and slice to serve.