baking powder
US /ˈbeɪ.kɪŋ ˌpaʊ.dər/
UK /ˈbeɪ.kɪŋ ˌpaʊ.dər/
1.
a mixture of bicarbonate of soda and cream of tartar, used as a raising agent in baking
:
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Add two teaspoons of baking powder to the flour.
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This recipe calls for a generous amount of baking powder for a fluffy cake.