We're reader-supported and only partner with brands we trust. When you buy through links on our site we may receive a small commission at no extra cost to you. Learn More. Product prices and availability are accurate as of the date and time indicated and are subject to change.
Here’s how to do it:
1. Add one cup of granulated sugar to your blender to make one cup of powdered sugar. Because sugar can scratch the sides of your blender, you might want to use a spice grinder or coffee grinder instead.
2. Add 1 to 1 1/4 teaspoons of cornstarch, if desired. This step is completely optional, but corn starch will help thicken the powdered sugar and prevent caking.
3. Blend or pulse at high speed for five seconds or until the sugar turns to powder.
4. Use the homemade powdered sugar immediately or store it in a container or zipper bag. Powdered sugar will keep indefinitely as long as it's in an air-tight container and kept away from water.