How to properly ice your cupcake. Wait until the fairy cakes are completely cooled before you ice them. You will need to make a simple, fondant-style glaze. You can make your own using cream, confectioner's sugar, a bit of vanilla extract, and a touch of food coloring. It's always a good idea to sift your confectioner's sugar before using it. This only takes a second (you can just pass it through a fine strainer) and will keep your icing from being lumpy. See website for rest of the recipe.