Preheat oven to 350°F (175°C). Grease a loaf pan and line with parchment paper.
In a bowl, mash bananas until smooth. Stir in brewed coffee, melted butter, brown sugar, and vanilla.
In a separate bowl, whisk together flour, baking soda, and salt. Slowly combine with the wet ingredients.
Pour the batter into the prepared pan. Bake for 50 minutes or until a toothpick comes out clean.
While the bread cools, prepare the espresso frosting: mix powdered sugar, butter, espresso, and vanilla until smooth.
Once the bread is cool, spread the frosting generously on top.
Slice, serve, and enjoy the caffeine-infused bliss.