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Edit Baking Powder Substitutions
Mix together a half a teaspoon of baking soda with a quarter teaspoon of cream of tartar and a quarter teaspoon of cornstarch. Mix them together well and you will have enough substitute baking powder for a recipe that calls for one teaspoon of baking powder.
You can make a batch of homemade substitute baking powder and save it until you need to use some baking powder.
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