Quick, easy, and delicious, this Grain-Free Blueberry Banana Breakfast Mug Cake turned me from a mug cake hater to a full-fledged believer. Gluten-free, dairy-free, soy-free, and Paleo, to boot! The naming of this recipe caused way more drama than need be. I mean, what do you call a recipe that is wholly cake-like, tastes like