Turtle Cake
["1 (18 1/2 oz.) pkg. chocolate cake mix", "1 (14 oz.) bag caramels", "3/4 c. butter or margarine", "1/4 c. evaporated milk", "1 c. chocolate pieces", "1 c. walnuts"]
["Preheat oven to 350\u00b0.", "Prepare cake according to package directions.", "Pour 1/2 of the batter into a greased and floured 13 x 9 x 2-inch pan.", "Bake 15 minutes."]
["chocolate cake mix", "caramels", "butter", "milk", "chocolate pieces", "walnuts"]