Mash bananas with a potato masher or fork. In a large bowl, mix butter into the mashed banana. Mix in the sugars, egg, and vanilla. Sprinkle the baking soda and salt over the mixture and mix in. Add the flours and mix to combine. Gently fold in the raspberries.
Pour mixture into a buttered 4×8 inch loaf pan.
Bake for 1 hour. Cool on a rack. Remove from pan and slice to serve.
Recipe by Flying on Jess Fuel at https://www.jessfuel.com/2015/05/13/raspberry-banana-bread/