Preheat oven to 350 degrees F. Lightly grease a 9"x 13" baking pan.

Mix cake mix with melted butter and 1/3 cup evaporated milk. Pat half of the mixture into lightly greased pan. Bake for 8-10 minutes.

Sprinkle chocolate chips and nuts over partially baked cake.

Melt caramels with remaining evaporated milk on stovetop in small pan, or in microwave. Drizzle over chocolate chips and nuts.

Pat remaining cake mixture on top and bake for another 20 minutes at 350 degrees.

Cut into squares when almost cool.