For the Meringue Ghosts 2 large egg whites, at room temperature ¼ tsp cream of tartar ½ cup white sugar Black decorating frosting For the Buttercream Frosting 1 stick unsalted butter, softened 2 cups confectioners’ sugar 1-2 tbsp milk Purple gel food coloring Supplies Needed Wilton tip #12 Wilton tip #3 Piping bags