Mash bananas until you have 2 1/4 cups of mashed bananas.
In another bowl, cream together the butter and brown and white sugars. Then, add the cinnamon, eggs, vanilla and mashed bananas, stirring until well blended.
Add the banana mixture into the bowl with the flour and stir. Be sure not to over stir.
Cover your pan with foil then create a foil handle for the pan. You will be placing this under your pan so the handles stick up and you can remove your pan from the Instant Pot.
Using the foil handles, remove the pan from the Instant Pot. Allow the pan to cool on a baking rack for a few minutes, then remove the banana bread from the pan and allow it to cool further on the baking rack.