How do I make a "baking powder" substitute in a pinch?
On the off-chance that you have no baking powder, but you do have baking soda and cream of tartar, you can make your own baking powder:


1 teaspoon baking soda
2 teaspoons cream of tartar
1 teaspoon corn starch (optional)


Mix it all together and use it immediately.

Reference: http://frugalliving.about.com/od/condimentsandspices/r/Baking_Powder.htm