Baking Soda and Cream of Tartar (Best Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 1 teaspoon baking powderThis substitute works because baking powder is essentially a mixture of baking soda (a base) and an acid (often cream of tartar). When combined, they react to produce carbon dioxide gas, which leavens the biscuit dough. Using these two separately allows precise control over the acid-base balance.
To ensure success, mix the baking soda and cream of tartar thoroughly into the dry ingredients to avoid uneven leavening. Use immediately after mixing to maximize the leavening effect as the reaction begins once wet ingredients are added.
Compared to commercial baking powder, this substitute yields very similar results in rise and texture, producing light, flaky biscuits with a neutral flavor profile.