Why Does This Happen To The Icing ?.
Baking By iosman123 Updated 5 Mar 2021 , 12:56am by ReginaCoeliB
Are you sifting your sugar? The only things I can think of is small lumps of sugar or butter, which was not completely incorporated into the mixture.
you don't list it with your ingredients but salt will do that --
I always used cane powdered sugar other sugars were not reliable --
It might also be the cornstarch in your powder sugar
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