Either bake german chocolate cake according to directions on german sweet chocolate package or from a mix.
Bake in a 9 x 13 pan. Cool 5-10 minutes. Then, using the end of a wooden spoon, poke holes in the cake every 1/2 to 1 inch. 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.