When it comes to baking, using the best ingredients is absolutely essential. Be sure to test whether your baking powder is fresh. Baking powder is a leavening agent that contains a combination of baking soda, an acid (such as cream of tartar), and a moisture absorber (such as cornstarch). Baking powder releases carbon dioxide gas bubbles when mixed with liquid, and this is what causes breads and cakes to rise.

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