2 Tbsp. cream of tartar 1 Tbsp. baking soda 1 Tbsp. cornstarch
Mix all ingredients well together. Use 1 tsp. of this mixture for each teaspoon of Royal or single-acting baking powder called for in a recipe. (Do not use when double-acting baking powder is called for. This is just a substitute in case you do not have baking powder on hand.
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