I ran out of powdered sugar, mid-frosting recipe the other day. Ack!! And since going to the store is quite a chore these days, I realized there must be a way to make my own. It’s shockingly simple and seemed to work quite well! (I used arrowroot powder in place of cornstarch.)
I’ll probably still buy some next time I have the opportunity, but it’s so nice to have this option in a pinch.