Baking Soda + Cream of Tartar (Best Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 1 teaspoon baking powderThis combination mimics the acid-base reaction of baking powder, producing carbon dioxide bubbles that help the frittata rise and become fluffy. The cream of tartar acts as the acid to activate the baking soda immediately upon mixing.
For best results, mix these two ingredients thoroughly into the dry components before combining with eggs. Avoid letting the batter sit too long before cooking to preserve leavening power.
Compared to commercial baking powder, this substitute offers similar lift and texture, ensuring the frittata is airy without any metallic or bitter aftertaste.