one-fourth cup powdered sugar

SweetenersYear-round

Composed almost entirely of carbohydrates in the form of sucrose, powdered sugar provides energy but contains negligible amounts of vitamins, minerals, or fiber. The addition of cornstarch does not significantly alter its nutritional profile.

About

Powdered sugar, also known as confectioners' sugar, icing sugar, or 10X sugar, is refined white sugar that has been ground into an extremely fine powder and combined with a small amount of cornstarch (typically 3-4% by weight) to prevent caking and moisture absorption. The ingredient originated in the 19th century as refinement technology advanced, enabling the production of finely milled sugar suitable for delicate pastries and icings. The cornstarch acts as an anti-caking agent, distinguishing it from granulated sugar. It dissolves readily in liquids and creates smooth, lump-free frostings and glazes without the grittiness of coarser sugars.

The term "10X" refers to the fineness of the powder relative to standard granulated sugar, indicating it has been milled approximately ten times finer. Powdered sugar is pure white in color with an exceptionally smooth, flour-like texture when properly stored.

Culinary Uses

Powdered sugar is essential in pastry and confectionery work, primarily used for creating smooth frostings, royal icing, buttercream, and ganache glazes. It dissolves instantly in wet ingredients, making it ideal for dusting cakes, cookies, and pastries, or incorporating into whipped frostings without grittiness. In American and European baking, it appears in cream cheese frostings, seven-minute frosting, and Swiss meringue buttercream. It also features in confections like fondant, marzipan, and candy coatings. Beyond sweets, powdered sugar is dusted over donuts, churros, and baked goods for decoration, and can be whisked into hot beverages. Its anti-caking cornstarch makes it less suitable for recipes requiring pure sugar with no additives, such as certain caramel preparations.

Forms & Preparations

Powder — The standard form—an ultrafine, flour-like powder used directly in frostings, glazes, and doughs, or for dusting.
Sifted — Passed through a fine-mesh sieve to remove lumps and aerate, essential for smooth frosting and preventing grittiness in delicate applications.
Whipped with fat — Combined with butter, cream cheese, or shortening to create smooth buttercream and frosting bases for cakes and cupcakes.
Paste (Royal Icing) — Mixed with egg whites or meringue powder and liquid to form a thick, pipe-able medium for decorative icing on cookies and cakes.

Substitutes

Unknown — Use equal weight; blend or process granulated sugar in a food processor or blender to achieve a finer texture, though the result will lack the cornstarch anti-caking agent and may be slightly grittier in frostings.
Unknown — Use equal weight as a direct substitute; produces a slightly less smooth texture in icings than powdered sugar but remains effective for most applications.
Unknown — Combine 1 tablespoon cornstarch with 1 cup granulated sugar, then grind in a food processor to approximate powdered sugar; this recreates the anti-caking formula if powdered sugar is unavailable.
Unknown — Functional substitutes for dusting and decoration only; not suitable for frostings due to different moisture absorption and flavor profile changes.