Unfortunately, we don't do extensive testing of sugar substitutes in our test kitchen here at King Arthur although we have a few recipes based on substitutes. As sugar substitutes do often behave differently than regular sugars, I would suggest looking for a credible source that has recipes written for the substitute you would like to use. I am not aware of anything akin to powdered sugar that is sugar-free, but I suspect you may be able to find other recipes for the same products done in a sugar-free manner from the start with some digging online. Happy Baking! Jocelyn@KAF

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