Recipe from SOUTHERN PLATE   Devil’s Food Butterfinger Cake Ingredients 1 box devil's food cake mix 1 14 ounce can sweetened condensed milk 1 12 ounce jar caramel topping 1 12 ounce container whipped topping (aka Cool Whip. Or make your own by whipping 1 cup heavy cream with 1/4 cup confectioner's sugar and 1 teaspoon