I haven't tried this yet, but my go-to for a powdered sugar substitute is Swerve brand "Confectioners Style" of erythritol sweetener. It subs 1 for 1 with powdered sugar and is a natural, not artificial, sweetener. Splenda would probably work as well, but it is a artificial sweetener and the binding agent they use (to make it substitute 1 for 1 with sugar) is a carby starch (maltodextrin). Happy baking! I'm hoping to make this tomorrow, so if I do, I'll be using confectioners Swerve and I'll update my comment :)

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