Mix cake as directed on package ( can use applesauce instead of oil, for a lower-fat cake)
Pour one-half of batter into a 13x9-inch greased and floured pan. Bake 15 minutes at 350 degrees.
While baking, Melt caramels with milk and pour over cake. Sprinkle chocolate chips over this, then sprinkle pecans over chocolate chips. Pour the other 1/2 cake mix batter over nuts.