all purpose flour baking powder bittersweet chocolate brown sugar butter butter/margarine cake cake flour canola oil chocolate coca-cola confectioners sugar corn syrup cream cheese dark brown sugar egg egg yolk flour granulated sugar heavy cream kosher salt light brown sugar low fat buttermilk marshmallow milk milk chocolate powder sugar powdered sugar pure vanilla extract red food coloring salt semisweet chocolate sour cream sugar unsalted butter unsweetened chocolate unsweetened cocoa vanilla vanilla extract vanilla frosting vegetable oil vegetable shortening water whipped cream white sugar white vinegar