Peel the bananas, slice them, and place in a freezer bag or glass container.
Freeze for at least two hours.
Place the frozen bananas and cocoa powder in a food processor, and blend until smooth, for several minutes. At first it'll look chunky, but as the bananas begin to melt a little, you'll see it form a supercreamy consistency.
Scoop into a bowl, sprinkle with a few chocolate chips if you're feeling zany, and enjoy!