Preheat your oven to 350°F (175°C) and prepare a loaf pan by greasing with cooking spray or lining with parchment paper.

Combine melted butter and packed brown sugar in a large mixing bowl, mix until glossy.

Mash the very ripe bananas directly into the mixture until desired texture is achieved.

Add eggs and vanilla extract, stir until well combined without overmixing.

In a separate bowl, whisk together flour, cocoa powder, baking soda, and salt, then fold gently into the wet ingredients.

Fold in chocolate chips if desired, ensuring even distribution.

Pour the batter into the prepared pan, optionally sprinkle with additional chips or walnuts on top.

Bake for approximately 65 minutes, checking doneness with a toothpick.

Allow to cool in the pan for 15 minutes, then transfer to a cooling rack.