Either bake german chocolate cake according to directions on german sweet chocolate package or from a mix. Bake in a 9x13 inch pan. Cool 5-10 minutes. Then, using the end of a wooden spoon, poke holes in the cake every half to 3 cm. Cool another 20 minutes. Drizzle sweetened condensed milk and butterscotch topping into hole (some will end up on top of the cake). Sprinkle crushed heath bars over the top. Serve with whipped cream or topping.