01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, mash the ripe bananas until smooth. Stir in melted coconut oil and vanilla extract until well blended.
03 - Add rolled oats, ground cinnamon, salt, and baking powder to the banana mixture. Fold together until all dry ingredients are fully incorporated.
04 - Gently fold in chocolate chips and chopped nuts, if using, distributing them evenly throughout the dough.
05 - Drop heaping tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart. Lightly shape and flatten with the back of a spoon.
06 - Bake for 13 to 15 minutes, or until cookies are set and edges are lightly golden.
07 - Let cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.