Baking Soda + Cream of Tartar (Best Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 1 teaspoon baking powderThis combination works because baking powder is essentially baking soda combined with an acid like cream of tartar. The acid-base reaction produces carbon dioxide gas, which helps create light, crisp granola clusters. In granola, this reaction also aids in the expansion of oat clusters during baking, improving texture.
To ensure success, mix the baking soda and cream of tartar thoroughly into the dry ingredients to allow even leavening. Avoid adding extra acidic ingredients that could alter the reaction balance. Watch for slight differences in browning as the acid may affect Maillard reactions.
Compared to commercial baking powder, this substitute provides a fresher, more controlled leavening effect with no added fillers, resulting in granola that is comparably crisp and well-textured.