You can substitute cocoa powder for baking chocolate and still achieve delicious results. An organic cocoa powder with 100% natural cacao is a great choice.

4. Add the melted chocolate to the egg mixture and mix just until combined. Stir in the sifted dry ingredients and mix just until combined, then stir in the bittersweet chocolate.

2 teaspoons baking powder. 1/2 teaspoon baking soda. 1/2 teaspoon salt. 2/3 cup unsweetened natural cocoa. 2 eggs. 2 egg yolks. 1/2 cup sugar. 1/2 cup sour cream. 1 1/2 teaspoons vanilla. 1/2 cup ...