You can make powdered sugar at home with this easy step by step tutorial! Also called confectioner’s sugar, this finely ground white sugar is an important part of many of your favorite frostings, cookies, and all types of desserts.
Add granulated sugar and cornstarch to your blender or food processor.
Blend together until fine, around 4-5 minutes in total.
Be sure to pause every minute or so, run your fingers through to see if it feels too gritty, and run your spatula around the sides to eliminate any clumps and granules.
Notes
Use one tablespoon of cornstarch for every cup of white granulated sugar.
If you’re making just enough powdered sugar for a recipe, expect the amount of granulated sugar you start with to double. One cup of granulated sugar = two cups of powdered sugar after blending.
To prevent powdered sugar from hardening, place it in an airtight container or cover original package tightly to seal.