Plain Yogurt

Another combination that functions well as a replacement for baking powder is yogurt and baking soda. Just be sure to use plain yogurt (not flavored).

Yogurt is produced by fermenting milk, much like buttermilk is. When combined with baking soda, plain yogurt's acidic pH makes it an ideal replacement for baking powder. Because plain yogurt offers the acidity needed for leavening, it performs better than other varieties. 1/4 teaspoon (1 gram) of baking soda and 1/2 cup (122 grams) of plain yogurt can be used in place of 1 teaspoon (5 grams) of baking powder in a recipe. Just like with buttermilk, the amount of liquid in the recipe should be adjusted according to how much plain yogurt is added.