Baking Powder (Best Option)
1 teaspoon per cup of flourBaking powder is a chemical leavening agent that releases carbon dioxide gas when moistened and heated, causing the batter to puff and create a light, crispy crust. Unlike yeast, it acts instantly, which suits the quick preparation of fried chicken batter.
For best results, mix baking powder thoroughly with the flour and avoid letting the batter sit too long before frying to retain maximum leavening power. Avoid overuse as it can impart a metallic or bitter taste.
Compared to yeast, baking powder produces a more consistent and crisp crust without the fermentation flavor, which is preferable in fried chicken where a neutral, crunchy coating is desired.