Preheat your oven to 350 degrees F or 177 degrees C, then put parchment paper over your baking sheet set aside.
Take a small mixing bowl, add the mashed bananas, maple syrup, almond butter, vanilla and mix well to combine.
In a different bowl, mix together the rolled oats, chocolate chips, chopped walnuts, salt and cinnamon.
Add the ingredients you mixed in the first bowl, to the oats mixture and mix well to combine.
Scoop out the cookie dough using a cookie scoop or a large spoon then place about 3 to 4 inches apart on the baking sheet. Gently press each cookie ball using your hand, or the back of spatula to flatten a bit.
Bake for about 15 minutes or until the sides turn slightly brown.
Enjoy these sweet healthy treat warm or at room temperature.