Pre-heat the oven to 350°F.
In a saucepan over medium-low heat, add in the unsalted butter. Allow the butter to melt & stir to avoid burning. Allow to cool for 10 minutes.
Whisk in the brown sugar until fully incorporated.
In a separate bowl, mash the overripe bananas. Add the bananas to the butter-sugar mixture. Whisk until fully combined.
Whisk in the egg & vanilla extract.
In a separate bowl, whisk together the flour, cocoa powder, espresso powder, baking soda, & salt.
Pour the flour mixture into the banana batter. Gently fold to combine.
Add in the chocolate chips.
Pour your mixture into a lined or greased bread pan.
Bake the bread at 350 for 55-65 minutes.
Allow the bread to cool at least one hour before slicing.
