01 -
Preheat oven to 350°F (175°C). Grease and line an 8x8-inch baking pan with parchment paper.
02 -
In a bowl, whisk melted butter, brown sugar, and granulated sugar. Add eggs, vanilla, and mashed bananas, mixing until smooth.
03 -
Sift in flour, cocoa powder, baking powder, and salt. Fold gently until just combined. Stir in chocolate chips.
04 -
Pour batter into the prepared pan and bake for 28–32 minutes or until a toothpick comes out mostly clean. Cool completely.
05 -
Whisk melted butter, powdered sugar, milk, and vanilla until smooth. Pour over cooled brownies.
06 -
Sprinkle with chopped walnuts, slice, and enjoy!