Mug cakes are fairly popular, but they often have egg. Here's a tasty version you can make for yourself in a flash! Food-allergy friendly, too! I highly suggest using Hershey's Special Dark cocoa powder in this recipe (I've switched to only using it instead of regular cocoa powder). It's richer, moister, and smoother! Variations: try coffee or rice milk instead of water, use other flavored chips, or add nuts.