Preheat oven to 350℉. Line an 8x4 inch loaf pan with parchment paper.
In a large bowl, whisk together the mashed bananas and eggs until smooth. Next, add in the peanut butter, vanilla, coffee and whisk together until combined. Mix in the cacao powder, baking powder and espresso powder until incorporated. Then, transfer the batter to the loaf pan and spread out evenly. Bake for 35-40 minutes or until toothpick comes out clean. Allow to set in the pan for 10 minutes and then transfer to a wire rack. Allow to cool completely.
Frosting:
In a small bowl using an electric hand mixer, beat the cream cheese, yogurt and powdered sugar until smooth. Once loaf is cooled, spread the frosting on the loaf evenly. Sprinkle on cacao powder.