I was taught this simple trick for making powdered sugar, so I'll pass it along. Powdered sugar bought at the store most often contains sugar and corn starch. That's no good for those of us with kids dealing with corn problems. Corn does horrible things to both of my daughters. So, make your own. Put regular sugar in a food processor and do it until it breaks down to a powder. You can add a starch to help recreate the "powder," like potato starch or arrowroot starch. Store some in a kitchen container.