Follow the directions for baking a 9 x 13 inch German chocolate cake. While cake is still hot, poke holes in top with a wooden spoon handle. Pour 1 can sweetened condensed milk over cake. Pour 1 jar Mrs. Richardson's butterscotch caramel sauce slowly over cake so cake absorbs it. Let cake cool. Spread 1 (8 ounce) container of Cool Whip over top. Crush 3 to 4 Heath candy bars and sprinkle over top. Refrigerate.