Preheat oven to 350 degrees F.
Mix cake as directed on box. Pour half the batter in a greased 9x13 pan and bake for 20 minutes.
Gently heat Jimmy's Caramel, butter and milk in microwave. Pour over the baked half of cake. Sprinkle chocolate chips and nuts over mixture. Pour the rest of the cake batter in pan and bake for an additional 20 minutes.
Top with whipped cream to serve.
Serving Size 12
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.