Preheat the oven to 350 degrees. Prepare a baking pan by lining with parchment or a silicone baking mat.

In a large bowl combine mashed banana, yogurt and vanilla extract. Stir in granola and mix until well combined. {If the mixture seems too "loose", let it sit for about 15-20 minutes until the granola soaks in the other ingredients and becomes easier to work with.}

Using a cookie scoop or a rounded tablespoon measure, scoop the mixture into little mounds onto the prepared baking pan. If desired, press the mounds down a little to flatten -- I just left them domed.

Bake for 13-15 minutes or until the cookies set and slightly browned around the edges.

Cool for 5 minutes before removing from baking pan.