teaspoonfuls baking powder

Baking powder is a chemical leavening agent composed primarily of sodium bicarbonate (baking soda), an acid (typically cream of tartar or sodium aluminum sulfate), and a moisture absorber (usually cornstarch or potato starch). It was developed in the 19th century as a more convenient alternative to yeast and is now ubiquitous in baking. Double-acting baking powder, the most common commercial form, releases gas in two stages: first when mixed with wet ingredients at room temperature, and again when heated, providing reliable and controllable leavening for cakes, cookies, biscuits, and quick breads. Single-acting and aluminum-free variants also exist for specialized applications.

Baking powder is essential in quick breads, cakes, cookies, and other baked goods where rapid leavening is required without fermentation time. It is particularly valued in American, British, and European baking traditions for producing light, tender crumbs and consistent rise. A typical recipe calls for 1 to 3 teaspoons per cup of flour, depending on the desired lift and the acidity of other ingredients. Baking powder is commonly combined with baking soda when acidic ingredients (buttermilk, yogurt, lemon juice) are present, and must be stored in cool, dry conditions to maintain potency, as moisture causes premature activation.