Step 1

Preheat the oven to 350 F and grease and line an 8x8-inch square pan with parchment paper.

Step 2

In a large mixing bowl, whisk together the butter, sugar, eggs, vanilla extract, and mashed banana.

Step 3

In a separate bowl, whisk together the cocoa powder, flour, salt, and baking powder.

Step 4

Sift the flour mixture into the bowl with the wet ingredients, then gently fold them together until just combined.

Step 5

Add the chocolate chips and fold the batter again.

Step 6

Transfer the mixture to your prepared pan and bake for 30-40 minutes or until a skewer poked into the center of the brownies comes out with no wet batter (a few moist crumbs are okay).

Step 7

Leave the brownies in the pan for about 15 minutes before transferring them to a wire rack to cool completely.

Step 8

Slice into 12 bars and serve.