These swirly cupcakes would be perfect for a kid's party, or to just have around for tucking into lunchboxes or serving with milk as an afterschool snack. (Adults will love them, too.) The chocolate part is made by mixing cocoa powder and just enough milk to form a paste, and this is spooned on top of the plain cupcake batter in the cups and then swirled with a toothpick before baking. While they are great as is, you could also spread Nutella on top if desired.