01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a large mixing bowl, beat together unsalted butter, creamy peanut butter, light brown sugar, and granulated sugar until the mixture is light and fluffy.
03 - Incorporate the mashed ripe banana, egg, and vanilla extract into the butter mixture, blending until smooth.
04 - In a separate bowl, whisk together all-purpose flour, baking soda, baking powder, and salt until evenly distributed.
05 - Gradually add the dry ingredient mixture into the wet mixture, stirring until just combined. Avoid overmixing.
06 - Gently fold semi-sweet chocolate chips into the dough.
07 - Scoop tablespoon-sized amounts of dough onto the prepared baking sheets, spacing each cookie approximately 2 inches apart.
08 - Bake for 11 to 13 minutes or until the edges are lightly golden and centers are just set.
09 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.