Baking Powder (Best Option)
1 1/2 teaspoons per 1 teaspoon yeastBaking powder is a chemical leavening agent that releases carbon dioxide gas when moistened and heated, causing the cake batter to rise quickly. This is ideal for chocolate cakes which are baked immediately after mixing, unlike yeast which requires fermentation time.
To ensure success, mix baking powder evenly into the dry ingredients and avoid overmixing the batter to prevent a dense texture. Baking powder’s leavening is immediate and short-lived, so bake promptly after mixing.
Compared to yeast, baking powder produces a lighter, more tender crumb without the yeasty aroma or flavor, which is generally preferred in chocolate cakes.