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Pipe the icing Put the cupcakes in the freezer for at least 1 hour.
onto the cupcakes. Hold the tip of the piping bag and gently squeeze so some of the icing comes out. Squeeze from the top of the bag, gradually working down as you use the frosting. Try to pipe a peak onto the top of each cupcake.  Start with just a little icing on each cupcake to ensure you have enough to frost each one, then go back and add more. Try to divide the frosting evenly across all 12 cupcakes. This should be about 2 tbsp (32 g). If you have different tips for your piping bag, a star tip really emphasizes the glowing effect! In order to ensure the cupcakes are sturdy enough to dip in your glow-in-the-dark concoction, they need to be chilled. Leave the cupcakes in the freezer for at least an hour, or you can leave them in overnight if you want. When the cupcakes are ready, the frosting should be hard to the touch.