Preheat your oven to 350°F (175°C) and prepare a 9x9 inch baking pan by greasing it or lining it with parchment paper.

Mash the ripe bananas in a large mixing bowl until mostly smooth.

Stir in the granulated sugar, brown sugar, and melted unsalted butter until well combined and creamy.

Beat in the eggs and vanilla extract until fully incorporated.

In a separate bowl, whisk together the all-purpose flour, unsweetened cocoa powder, baking soda, and salt.

Gradually fold the dry ingredients into the wet banana mixture, combining until just mixed.

Fold in the chocolate chips if desired.

Pour the batter into the prepared baking pan and spread it evenly.

Bake for approximately 25 minutes, checking with a toothpick inserted in the center.

Let the brownies cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely.