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 (optional), baking powder, & 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 double chocolate chip banana bread at 350 got 55-65 minutes.

Allow the double chocolate chip banana bread to cool at least one hour before slicing.