Preheat the oven to 350 ºF (175 ºC) and line a 9"x 9" baking sheet with parchment paper (any pan work, just make sure you press the mix to have a ¼" inch layer)
Mash the bananas in a medium bowl until most nice and creamy.
Stir in the peanut butter until it combines with the mashed banana.
Mix the rolled oats and the remaining ingredients (except for 2 separate tablespoons of maple syrup) until everything is well-combined.
Transfer the bar mixture to the prepared baking pan and press it into an even layer.
Bake on the center rack of the oven for 18 to 25 minutes or until the edges of the bars are golden-brown.
Let cool. Once the bars are fully cooked, remove them from the oven and let them cool for 15-30 minutes before slicing them into the desired shape and serving.
Please wait at least 30 minutes before cutting the bars so they don´t crumble. I recommend waiting hours or overnight to ensure they cut well. Don't use a sewed knife. Use a chef´s knife and make sharp cuts.If you don´t use chocolate chips, I recommend drizzling a tablespoon of maple syrup on top, to give it an extra sweetness touch.
Video
Notes
You can use any kind of nut butter, such as almond, cashew, and hazelnut/cocoa (AKA Nutella).If you like salty chocolate you can sprinkle salt flakes into the mixture before baking it.