**Preheat Oven:** Preheat your oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal.
**Mix Wet Ingredients:** In a large bowl, whisk together the mashed bananas, melted butter, granulated sugar, brown sugar, eggs, and vanilla extract until smooth.
**Combine Dry Ingredients:** In a separate bowl, mix the flour, baking powder, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
**Add Chocolate Chips:** Fold in the chocolate chips, reserving a handful to sprinkle on top.
**Bake:** Pour the batter into the prepared pan, spreading it evenly. Sprinkle the reserved chocolate chips on top. Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
**Cool and Serve:** Allow the bars to cool completely in the pan before lifting them out using the parchment paper. Slice into squares and enjoy!