Cupcake recipe can be halved or doubled with great results. Please note that I developed the frosting recipe using a kitchen scale then converted it to volume, so please use a scale for maximum accuracy if available. The frosting makes enough to frost 20 to 22 cupcakes, yielding a 1:2 ratio of frosting to cupcake. If you don't like a lot of frosting, you can halve the recipe. Alternatively, if you like piles of frosting, you can make 1½ to double the recipe, according to how much you like on there. Make sure you have 1 (750g) jar of Nutella or 2 (350g) jars for this recipe.