Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.

In a mixing bowl, mash the ripe bananas until smooth.

Add melted butter, sugar, eggs, brewed coffee, and vanilla extract to the mashed bananas; mix well until combined.

In a separate bowl, whisk together flour and baking powder; gradually add to the wet mixture and stir until just combined.

Pour the batter into the greased dish and bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.

Allow to cool slightly before slicing and serving.