Preheat your oven to 350°F (175°C). Grease a 9x9 inch baking pan or line with parchment paper.

Mash 2 ripe bananas until smooth with minimal lumps, using very ripe bananas for maximum sweetness.

Add granulated sugar, brown sugar, and melted unsalted butter to the mashed bananas, mixing until combined.

Beat in 2 large eggs, one at a time, followed by 1 teaspoon of vanilla extract until the batter is homogeneous.

Whisk together 1 cup of all-purpose flour, 1/2 cup of unsweetened cocoa powder, 1/2 teaspoon of baking soda, and a pinch of salt in a separate bowl.

Gradually fold the dry ingredients into the wet mixture until combined, about 30 seconds.

Gently fold in chocolate chips or nuts into the batter for added texture.

Pour the brownie batter into the prepared baking pan and spread into an even layer.

Bake in the preheated oven for about 25 minutes until a toothpick comes out mostly clean.

Allow the brownies to cool in the pan for approximately 10 minutes before transferring to a wire rack.