This is an interesting recipe... It's very easy to buy baking powder these days so it makes me wonder when will we really need this recipe? But, you will never know right? ^_^

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Baking Powder

1/2 teaspoon cream of tartar
1/4 teaspoon baking soda
1/4 teaspoon cornstarch

Mix together, store in refrigerator. Can be doubled or tripled.