• 3 cups All-purpose flour
• 1 1/2 tsp Baking powder
• 1 lb Chocolate, semisweet
• 1 1/2 cups Cocoa powder, unsweetened Dutch-process
• 3/8 cup Cocoa powder, Dutch-process
• 1/2 cup Confectioners' sugar
• 7 cups Granulated sugar
• 1 Tablepoon baking soda
• 2 tsp Vanilla extract, pure