To decorate the cupcakes, you can either dollop on some icing and swirl it with a knife or use a piping bag. Either fill a disposable piping bag with the icing and snip off the end or fill a ...

spread about a tablespoon of icing onto each cake. This buttercream makes enough for a modest swirl, should you wish to use a piping bag to decorate your cupcakes.

Transfer each color into a piping bag with a star nozzle. Once the cupcakes are fully cooled, pipe the icing onto each one in ...