Preheat the oven to 350ºF. Line a baking sheet with parchment paper.
In the bowl of a food processor, blend bananas and oats until bananas are smooth but you can still see the oats. Transfer mixture to a bowl. Add chocolate chips and mix with a spoon.
Divide dough evenly into 12 small cookies and place onto the parchment paper.
Bake for 12 to 15 minutes, or until bottoms are firm and tops are slightly golden.
TIP: Keep any extra cookies in the fridge and eat at room temperature, or warm them in the toaster oven for a few minutes.