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Preheat oven to 350ºF and prepare two 8″ cake pans with cake goop or other cake release.
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Combine together flour, baking soda, baking powder, cinnamon and salt and set aside.
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Combine together buttermilk, thawed banana (drain off the excess liquid), oil and vanilla. Whisk and set aside.
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Place softened butter in the bowl of a stand mixer with the paddle attachment and cream until smooth. Sprinkle in brown and white sugar and whip on medium until light and fluffy.
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Add in your eggs one at a time, waiting for them to be combined before adding the next.
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Add in 1/3 of your flour mixture and then 1/3 of your liquid. Alternate two more times and mix until just combined.
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Pour into your prepared cake pans and bake for 35-40 minutes until a toothpick comes out cleanly. Let cool fully before frosting.