Preheat oven to 375 degrees F. Line a cookie sheet with parchment paper or a silicone mat.
In a large bowl, add the ripe bananas and mash well. Add the baking soda, salt, ground flaxseed, cinnamon, vanilla, peanut butter, maple syrup, and oil. Stir with a spatula until well combined.
Add the flour and oats. Stir until just combined. Fold in chocolate chips. You can also add some nuts if you would like.
Use a cookie scoop (mine was 1.5 Tbsp) and scoop dough onto prepared pan. Add some additional chocolate chips on top. Slightly flatten cookies. Bake for 10-12 minutes or until cookies are just set. Let it cool on the pan for 10 minutes, then transfer to a wire rack to cool completely. Enjoy! Store in an airtight container.