Out of baking powder?
If out of baking powder, use 1/2 teaspoon cream of tartar with 1/4 teaspoon baking soda and 1/4 teaspoon cornstarch for every 1 teaspoon baking powder needed.
If out of baking powder, use 1/2 teaspoon cream of tartar with 1/4 teaspoon baking soda and 1/4 teaspoon cornstarch for every 1 teaspoon baking powder needed.