Peel your bananas and then cut them into chunks and place on a parchment-lined baking sheet.
Place the baking sheet in the freezer for at least an hour to freeze.
Remove from the freezer and add to your blender or food processor.
Add the rest of the ingredients.
Blend. You may have to stop and scrape down the sides a few times, but stick with it, and eventually you will be rewarded with a creamy ice cream.
Taste and see if it's sweet enough (it depends on how ripe your bananas are--riper bananas are sweeter, less ripe ones are less sweet) and if you feel like it needs a bit more sweetness, add a little maple syrup and blend again.
Eat immediately, or scrape into a covered container and store in the freezer.