Alleviate Mug cake Banana bread con chocolate review. Place remaining chocolate batter on top. Since there is no added sugar in this recipe, you'll definitely want to use a (very) ripe banana to bring in the sweetness. And (GASP!) make this ultra-super EASY banana bread in a mug cake recipe for DINNER, you would still be happy. Seriously, this is the best mug cake I've ever tasted before: it's moist, sweet and full of pure banana...