Preheat the oven to 350F degrees. Line a 9x5 inch loaf pan with parchment paper leaving an overhang, or grease and flour.
In a large bowl whisk together the melted butter and sugar, followed by the eggs and vanilla.
Stir in the mashed bananas.
Fold in the flour, cocoa, baking soda, baking powder, cinnamon, and salt. Then stir in the chocolate chips.
Pour/spoon the batter into your prepared pan.
Bake for 50-55 minutes until an inserted toothpick comes out clean (minus any melted chocolate chips).
Allow the bread to cool completely before removing from the pan and cutting into slices.