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Export 4 ingredients for grocery delivery
Add icing sugar to Thermomix bowl. Whizz for 10 seconds / speed Set aside.
Chop butter into pieces and add to bowl. Mix to soften for 30 seconds / speed 5.
Add the milk, vanilla extract, icing sugar and food coloring (if using). Mix 30 seconds / speed 5.
Transfer to piping bag for frosting cupcakes.