01 - Preheat oven to 350°F and line an 8x8-inch baking pan with parchment paper.
02 - In a large mixing bowl, blend mashed bananas, creamy peanut butter, eggs, maple syrup, and vanilla extract until smooth.
03 - Add ground cinnamon, sea salt, and baking soda. Stir thoroughly to combine.
04 - Fold in dark chocolate chips if desired.
05 - Transfer batter to prepared pan, spreading evenly to the edges.
06 - Place pan in oven and bake for 20 to 22 minutes, or until center is set and a toothpick inserted in the middle emerges clean.
07 - Allow bars to cool completely in the pan before slicing into portions.