Peel the bananas and roughly break them up into smaller 1 inch chunks. Freeze them until they are fully frozen (at least 2 hours).
In a food processor or high-speed blender, add the frozen bananas, peanut butter and cocoa powder. Blend until well combined.
Serve immediately if you enjoy ice cream with a soft serve consistency. For a firmer consistency, pop it in the freezer for an additional 30 mins. Enjoy!