Rainbow Frosting swirls are SO easy to make! Use this rainbow icing trick for St. Patrick's Day desserts, birthday cakes, and more!
Divide and color your buttercream. Pipe stripes of rainbow frosting onto a sheet of plastic wrap.
Roll the frosting up into a burrito shape. Hold the ends and twist quickly to seal it closed. Snip off one end.
Place a large star tip inside a piping bag. Insert the frosting, snipped side down, into the piping bag.
Pipe big swirls of frosting on top of your cupcakes or cake, and enjoy!