Mash the bananas into a bowl until smooth.
Beat the egg into the mashed banana.
Add some cocoa powder and mix together.
With the frying pan on a high heat and a fair amount of oil/oil spray, add a small dollop of pancake mixture. (The pancakes work better if you make them smaller, as they're easier to flip over etc.)
Let the pancake cook on one side for a minute or so before you flip over.
You can use a variety of different toppings for the pancakes. For these, I added a tiny bit of boiling water to some peanut butter to make a peanut drizzle.