Preheat the oven to 350°F (175°C) and grease a loaf pan.
In a bowl, mash the bananas and mix with melted butter, sugar, eggs, and vanilla.
In a separate bowl, combine flour, baking soda, and salt. Gradually add to the banana mixture.
For the mocha swirl, beat together cream cheese, powdered sugar, coffee, and cocoa powder until smooth.
Pour half the banana bread batter into the prepared pan, then add half of the mocha cream cheese mixture on top.
Swirl the mocha mixture into the banana batter using a knife or skewer.
Repeat with the remaining batter and mocha mixture, then swirl again.
Bake for 55 minutes, or until a toothpick comes out clean.
Cool in the pan for 10 minutes before transferring to a wire rack to cool completely.