Prepare about 3 medium-sized bananas. Mash the bananas with a fork and make 1 1/2 cups of mashed banana.
In a bowl, mix the mashed banana with the rest of the ingredients. Mix until everything is well combined.
Pour the base into an empty CREAMi pint. Place the storage lid on a pint and freeze for 24 hours.
Remove the pint from the freezer and remove the lid from the pint. Place the pint into the Ninja Creami Ice Cream Maker.
Select LIGHT ICE CREAM. Run the program.
When processing is complete, remove the ice cream from the pint.
Optionally, you can add any toppings you like now. Serve immediately.