Ingredients: 1 ½ cups all-purpose flour  ¾ cup cocoa powder  ½ teaspoon baking soda  ⅜ teaspoon salt  ½ cup dark corn syrup  One large egg white  One teaspoon vanilla extract  12 tablespoons unsalted butter, softened  ⅓ cup packed dark brown sugar  ⅓ cup granulated sugar  ½ cup granulated sugar for rolling  4 ounces bittersweet or […]