Let's face it, just about everyone loves chocolate. And no wonder -- many of the compounds contained in chocolate cause receptors in the brain to chemically induce feelings of pleasure (Read more about this in Can chocolate give me a happy high?). Chocolate is eaten by people all over the world, and for many of us, dessert and sweet treats are synonymous with the flavor.
Perhaps the main reason that chocolate cupcakes are so popular is because they use a winning combination: chocolate on chocolate. However, just because chocolate cupcakes have chocolate cake and frosting doesn't mean they're all the same. A rich dark chocolate cake spread with creamy white chocolate icing differs significantly from a milk chocolate cake topped with chocolate ganache. It's all chocolate, so you know it's going to be good, but it doesn't all taste the same.