This carrot mug cake mix is the sweetest way to eat your vegetables. A cozy blend of both carrot cake and spiced cake. This carrot-cake-in-a-mug recipe mixes up in a large mug, making it a shareable treat. Simply combine carrot cake mix with flour, baking powder, butter, and egg, microwave about 90 seconds, and serve warm topped with a quick drizzle of cream cheese icing.