Start by slicing 5 bananas, then place them all in a bag and freeze them until they are completely frozen. Next, repeat the same process with all the bananas.

Now, take the frozen bananas out of the freezer and gradually add them to the blender. Now, blend well until you obtain a very creamy mixture. Repeat the process gradually with all the bananas.

Finally, if you like, you can sprinkle some ground cinnamon on top and serve.