01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper.
02 - In a large mixing bowl, combine mashed bananas, peanut butter, eggs, maple syrup, and vanilla extract. Mix until smooth and fully incorporated.
03 - Add cinnamon, salt, and baking soda to the wet mixture. Stir thoroughly until no dry pockets remain.
04 - Gently fold in dark chocolate chips if using, distributing evenly throughout batter.
05 - Pour batter into prepared pan, spreading into an even layer with spatula.
06 - Bake for 20-22 minutes until center is set and toothpick inserted comes out clean.
07 - Allow to cool completely in pan before slicing into bars for clean cuts.