But baking powder is often made by combining baking soda with cream of tartar. Together, the two form little air bubbles that help make your baked goods light and fluffy. To DIY a substitute for 1 ...

Without cream of tartar, the cake would collapse, so it's best to save this dessert for another day if you don't have it.

Cream of tartar, which is sold in most baking aisles ... It's one of the easiest substitutes as long as you have some in your pantry. Look for it in the baking aisle with the other flours.