Preheatthe oven to 190°C / 374°F.
Prepare a tray of 12 muffins with their paper molds.
In a large bowl, sift together the flour, baking powder, baking soda, salt, and cocoa powder. Mix and set aside.
In another bowl add the peeled bananas, mash with a fork until pureed.
Addthe eggs, sugar and vanilla. Mix.
Add the melted butter while theingredients are being mixed.
Continue mixing until everything is well incorporated.
Transfer the liquid ingredients over the dry ingredients and mix until everything is moistened.
Distribute the mixture evenly in the 12 spaces of the muffin pan.
Take to the preheated oven and bake forapprox. 18 minutes.
Once baked, let rest for 10 minutes in the pan and then transfer to a wire rack to cool completely.