Preheat oven to 350 degrees F and brush sides of an 8x4 inch loaf pan with oil or spray with non-stick spray.
Combine the flour, baking soda and salt in a large bowl and stir.
Add bananas, beans, sugar, oil, eggs and vanilla to a food processor or blender. Pulse a few times - chunks are ok!
Pour the banana mixture into the large bowl of dry ingredients. Stir until just combined.
Add the blueberries and stir once or twice through.
Pour this mixture into the prepared loaf pan. Bake for about 55 minutes. Sprinkle a few blueberries on the top if you want.
It's done when the top is springy to the touch and an inserted toothpick comes out clean. Cool on a rack for about 10 minutes and then take it out of the pan. Slice and enjoy warm.