Yes. The standard home recipe for making the equivalent of 1 teaspoon of commercial baking powder is 1/2 teaspoon of cream of tartar, 1/4 teaspoon of baking soda, and - if you plan to store your supply - 1/4 teaspoon of cornstarch. The cornstarch absorbs moisture in the air and therefore prevents a premature chemical reaction between the acid and alkali. When using homemade baking powder, work quickly, because the carbon dioxide gas is released more quickly and at a lower temperature than is the case with the commercial double-acting powders.
** Asian Recipes