โญ Baking Soda and Cream of Tartar (Best Fat-Free 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 with moisture and heat, they react to release carbon dioxide gas that leavens the dough. In scones, this reaction is critical for the light, flaky texture.
To ensure success, mix the baking soda and cream of tartar thoroughly with the dry ingredients before adding wet ingredients to guarantee even distribution. Avoid overmixing the dough to prevent toughness.
Compared to commercial baking powder, this substitute produces nearly identical rise and texture, preserving the classic tender and flaky scone crumb.