Several desserts are finished off with confectioner's sugar, from flourless chocolate cake to funnel cake to raspberry tart to Greek specialties such as kourabiethes (Greek walnut sugar cookies). So what do you do if you find yourself without this crucial ingredient? You make your own! Homemade powdered sugar is quick and easy to put together and is simply made with white granulated sugar.
Whether you run out, or just need a cup or two, making confectioner's sugar, also known as "powdered sugar" and "icing sugar," is as easy as turning on the blender. This method can be used to make larger quantities, but it is a real time-saver for last-minute needs when you are knee-deep in a recipe.
What You Need
All you will need is a blender, measuring cup, a clean dish towel, sugar, and cornstarch if you choose to add. For each cup of confectioner's sugar needed use one cup of regular granulated sugar.
How to Make It
Put the granulated sugar into the blender and secure the lid. Place the dishtowel over the top of the blender to catch any powder "smoke." Blend using the pulse method until the sugar turns to powder. This method works best in small quantities, 1 to 2 cups at a time.
If you are making even a smaller amount, alternatively you can use a coffee grinder, spice grinder, or mini-food processor. Just be mindful that the sugar crystals can scratch plastic, so consider carefully before making the powdered sugar in a plastic blender or processor.
Cornstarch or other additives are used in commercial products, so homemade may not taste the same as store bought. If the sugar's flavor doesn't match what you need, try adding 1 to 1 1/4 tablespoons of cornstarch for each cup of sugar. Blend along with the sugar.