"Better Than You Know What" Cake

I have often heard this cake referred to as "Better Than Sex Cake," which I've seen a few variations of, but this one has always been a favorite. I fixed it for the missionaries last night, and had to switch the name to "better than scriptures" cake.  For some reason, the other name didn't seem quite appropriate :)  It is so easy, but oh so tasty.

1 box chocolate cake mix
1 can sweetened condensed milk
1 jar caramel sauce (12 oz)
1 container Cool Whip
2 Heath or Skor candy bars, broken into small pieces (or toffee bits, 1/3 to 1/2 cup)

Bake chocolate cake mix as directed in 9 x 13 inch pan. When done poke holes in cake with wooden spoon handle. Pour 1 can Eagle Brand milk over top, then pour a jar of caramel sauce over milk. Let cool.  Frost with Cool Whip. Crush or break, in small pieces, 2 Heath or Skor bars, sprinkle over top of Cool Whip. Refrigerate. Simple and easy, but very good.