Put the butter, icing sugar, milk, Nutella and a tablespoon of recently boiled water in a large mixing bowl.
Beat until light and smooth β itβs quickest to use an electric whisk.
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Notes
If you'd like to use on cupcakes, transfer into the piping bag with the nozzle in place and twist. Pipe the frosting on top of the 12 muffins in generous, rising swirls β sharing it all evenly.