1-Preheat oven to 350°F (175°C): Line an 8×8-inch baking dish with parchment paper and spray with cooking spray to prevent sticking.

2-Cream together the 1/2 cup unsalted butter and 1 cup packed light brown sugar until smooth and fluffy; this step ensures a light texture.

3-Add the 1 large egg, 1 1/2 teaspoons vanilla extract, and 1/2 teaspoon fine salt; mix until fully combined for even flavor distribution.

4-Stir in 1 cup all-purpose flour until just incorporated, being careful not to over-mix to keep the bars tender.

5-Fold in 1 cup mashed overripe banana, then add 3/4 cup chocolate chips, reserving some for the topping to enhance the visual appeal.

6-Pour the batter into the prepared pan and sprinkle the reserved chocolate chips on top for a delicious finish.

7-Bake for 33-37 minutes until the edges are golden and the center is set, rotating the pan halfway through for even baking. Cool completely on a wire rack before cutting into 16 squares with a warm sharp knife.