What does baking powder not contain - Ascorbic acid
Baking powder is a dry chemical leavening agent that is made with baking soda, cream of tartar and cornstarch. Generally, one teaspoon of baking powder is used to raise a mixture of one cup of flour, one cup of liquid, and one egg. Baking powder is most often found in quick breads like pancakes, waffles, and muffins. scone recipe 
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