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Preheat oven to 300 degrees F. Line 1 large loaf pan with parchment or wax paper (do not grease or flour).
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In a medium sized bowl, mash bananas with a fork (bananas should be overly ripe- the mushy ones with all the black dots). Set aside.
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Whisk together flour, baking soda, and salt, and set aside.
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Cream butter and sugar together for 2-3 minutes (I use my paddle attachment on my mixer).
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Add eggs, one at a time, and beat until well combined.
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Add mashed bananas and vanilla extract and mix well.
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Add half of the flour mixture and mix on LOW speed until just combined. Add buttermilk and mix on LOW until just combined. Add the remaining flour and mix on LOW until just combined.
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Stir in walnuts with a spatula. Be careful not to overmix.
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Pour batter into prepared pan and bake for one hour.
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Cool completely before removing from pans.