Preheat your oven to 350°F (175°C) and prepare a 9x9 inch baking pan.

Mash the ripe bananas in a mixing bowl until smooth.

Combine granulated sugar, brown sugar, and melted unsalted butter with the mashed bananas.

Mix in the beaten eggs and vanilla extract until well incorporated.

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

Gently fold the dry ingredients into the banana mixture until just combined.

If desired, fold in chocolate chips and any optional add-ins.

Pour the batter into the prepared baking pan and smooth the top.

Bake for about 25 minutes, checking for doneness with a toothpick.

Cool the brownies in the pan for 10 minutes, then transfer to a wire rack to cool completely.