Preheat your oven to 350°F (175°C) and line an 8×8-inch baking pan with parchment paper

Mash the ripe bananas in a bowl until smooth and set aside

In a large bowl whisk together melted butter granulated sugar and brown sugar until smooth

Add eggs and vanilla extract whisking until fully combined

Stir in the mashed bananas and mix until well incorporated

In a separate bowl sift together flour cocoa powder baking powder and salt

Gradually add the dry ingredients to the wet ingredients stirring gently until just combined

Fold in chocolate chips and chopped nuts if using

Pour the batter into the prepared pan and spread evenly

Bake for 20-22 minutes for fudgy brownies or 25-27 minutes for a cakier texture

Check doneness with a toothpick inserted into the center it should come out with a few moist crumbs

Let the brownies cool completely in the pan before cutting into squares