01 - 
                Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking dish.
              
              
              
                02 - 
                In a large mixing bowl, mix melted butter and brown sugar until smooth.
              
              
              
                03 - 
                Beat in the eggs one at a time, then stir in the vanilla extract.
              
              
              
                04 - 
                In a separate bowl, whisk together flour, baking powder, and salt.
              
              
              
                05 - 
                Gradually add the dry ingredients to the wet mixture, mixing until just combined.
              
              
              
                06 - 
                Fold in the sliced bananas and chocolate chips.
              
              
              
                07 - 
                Spread the batter evenly in the prepared baking dish.
              
              
              
                08 - 
                Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
              
              
              
                09 - 
                Allow the bars to cool before cutting into squares and serving.