confectioners/powdered sugar

Powdered sugar, also known as confectioners' sugar or icing sugar, is granulated sugar that has been finely ground into a powder and mixed with a small amount of cornstarch or tapioca starch to prevent caking. The starch typically comprises 3-5% of the mixture by weight and absorbs moisture that would otherwise cause the sugar crystals to clump. Powdered sugar dissolves quickly and integrates smoothly into batters, frostings, and glazes, making it distinct from granulated sugar's larger crystals. It was first commercially produced in the 19th century as the technology for fine grinding became available, and the addition of anti-caking agents was developed to improve shelf stability.

Powdered sugar is essential in pastry work, primarily used for frostings, buttercreams, royal icing, and glazes where a smooth, lump-free finish is required. It dusts baked goods such as donuts, scones, and pastries, and is incorporated into icings for cakes and cookies. Beyond confectionery, it appears in meringues, fondants, and confectionery creams. The ingredient dissolves readily in liquids, making it ideal for thin glazes and wet applications. It is also used in some savory contexts, such as dusting on fried foods or incorporating into dry spice rubs for baked goods, though its primary domain remains sweet applications. When using powdered sugar, sifting before incorporation helps eliminate lumps and ensures even distribution.