Cut the banana into slices about 3/4-inch thick and place them on a microwave-safe plate. Microwave on 60% power for about 7 minutes, until most of the moisture has boiled out of the banana:
Scrape the banana off the plate while it is still hot (makes cleanup easier) and allow to cool.
Pulse the cashews in the food processor until coarsely ground. Add the flax seed and oatmeal and pulse a few more times.
Add the banana and dates, and scrape the seeds from the vanilla bean into the processor. Blend into a thick paste.
Moisten your hands. Scoop up the paste by heaping teaspoons and form into 10 small balls. Place each one on a plate, not touching. Cover and keep refrigerated.
Notes
*Be sure to use certified gluten-free oats if gluten is a concern.