Preheat your oven to 350°F (175°C) and grease a loaf pan.
Mash the bananas until smooth and lump-free.
Mix in melted butter, brown sugar, eggs, and vanilla until combined.
Sift together the flour, cocoa powder, baking soda, and salt.
Alternate adding dry ingredients and espresso into the banana mixture, mixing gently.
Fold in the chocolate chips.
Pour the batter into the prepared loaf pan, smoothing the top.
Bake for 50-55 minutes, or until a toothpick comes out with only a few crumbs.
Cool the bread in the pan for 10 minutes, then transfer to a wire rack.
Whisk the glaze ingredients until smooth, then drizzle generously over the cooled bread.
Slice and enjoy—preferably with more coffee.