Baking Soda + Cream of Tartar (Best Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 1 teaspoon baking powderBaking powder is essentially baking soda combined with an acid, commonly cream of tartar. When these two are combined in the correct ratio, they produce carbon dioxide gas during cooking, which aerates the batter or coating, creating a light and crispy texture. This is critical in fried chicken to avoid a heavy or greasy crust.
For best results, mix the baking soda and cream of tartar thoroughly into the dry ingredients to ensure even leavening. Avoid overmixing the batter to prevent gluten development, which can toughen the crust.
Compared to commercial baking powder, this homemade substitute provides a fresher, more controlled leavening effect, often resulting in a slightly crisper and more evenly textured coating.