Place the banana chunks in food processor fitted with the S blade. Turn the motor on and let it run until the bananas have been blended into a creamy mixture with the texture of soft serve ice cream. This may take a couple of minutes, and your food processor might make some loud noises, but trust me, it'll work (note: mini food processors won't work for this recipe). If you want a step-by-step tutorial, check out
this post.