Heat oven to 350 F.

Grease and line an 8 x 8 square baking pan with parchment paper.

Heat butter in a saucepan over medium heat or microwave in a microwave-safe bowl until fully melted. Pour the unsalted butter into a large bowl and whisk in the granulated sugar, eggs, and vanilla.

Sift in the dry ingredients (flour and salt).Split the batter in half into a medium bowl for each batter. Add the bananas to make the banana bread batter and stir with a rubber spatula. Add the cocoa powder, sugar, and dark chocolate chips to make the brownie batter.

Take your prepared pan and dollop spoonfuls of half the brownie batter into the bottom of the pan. Pour the banana mixture on top. Drop spoonfuls of the remaining brownie batter on top and gently swirl the mixtures together with a butter knife.

Sprinkle the extra chocolate chips on top of the batter.

Bake 40-45 minutes until a toothpick inserted into the center of the brownies comes out clean. Remove to a wire rack to cool.

Chill in the refrigerator in order to slice neatly These brownies are very rich, so we like to slice into 16 small portions.

Serve warm or at room temperature, topped with a scoop of vanilla ice cream or some whipped cream.