Powdered sugar, also known as icing sugar or confectioners sugar, is granulated sugar that has been crushed into a fine white powder. The sugar often is added to frosting and dessert recipes. It contains cornstarch which prevents it from forming lumps, but the cornstarch can cause a recipe to thicken. When you run out of granulated sugar, you can substitute powdered sugar to your recipe if thickening will not ruin the taste and texture.
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Look at the recipe to determine how much granulated sugar you will need.
Substitute 1 3/4 cups of packed powdered sugar for every 1 cup of granulated sugar.
Add the sugar according to the recipe.