Did you run out of baking powder like we did, on the holiday, when even the convenience stores were closed? You can make your own, and it will last about a month in a bottle on the shelf. Cream of tartar is a bi-product of making wine, for those who like to know the origin of everything they eat.
Mix together:
4 parts cream of tartar
3 parts cornstarch
2 parts baking soda
For a small batch, use a teaspoon as the measure – this will yield 3 tablespoons of baking powder (9 teaspoons), which is less than a quarter cup.
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Why is this baking powder only good for about a month? What limits it from being good for a much longer period of time?