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Preheat oven to 350 degrees F (175 degrees C). Grease a 9x5 inch loaf pan.
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In a large bowl, stir together the melted butter and sugar. Add the eggs and vanilla, mix well.
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Combine the flour, baking soda and salt, stir into the butter mixture until smooth.
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Finally, fold in the sour cream, walnuts and bananas. Spread evenly into the prepared pan.
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Bake at 350 degrees F (175 degrees C) for 60 minutes, or until a toothpick inserted into the center of the loaf comes out clean. Cool loaf in the pan for 10 minutes before removing to a wire rack to cool completely.