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, peanut butter, eggs, maple syrup, and vanilla extract until fully combined.
03 - Incorporate ground cinnamon, sea salt, and baking soda into the batter until evenly distributed.
04 - Gently fold dark chocolate chips into the mixture, if desired.
05 - Pour batter into prepared pan and smooth surface for even baking.
06 - Bake in the preheated oven for 20 to 22 minutes, until the center is set and a toothpick inserted in the center comes out clean.
07 - Allow bars to cool completely in the pan before slicing into individual portions.