Set oven to 350 degrees. Mix cake mix as directed. Pour 1/2 batter in greased 9"x13" pan and bake 20 minutes.
Melt Kraft caramels, butter and milk (I use microwave for this). Pour over already baked cake. Sprinkle chips and nuts over this. Pour rest of batter on top. Bake 20 minutes more. Easy and delicious!