What’s the most dangerous cake in the world? Some say wedding cake, but a better answer, I think, is mug cake. A mug cake is a single serving of cake made by quickly stirring up batter in a mug and nuking it in the microwave. It apparently came to widespread public attention in a YouTube video back in 2009. The publisher of the video said she got the recipe in an email, but a year earlier the King Arthur Flour company published a mug cake recipe in its magazine observing that the recipe was