Mix pumpkin, sugar, pumpkin pie spice, eggs and 1 cup milk until blended; pour into 13x9-inch pan sprayed with cooking spray. Top with chopped chocolate; sprinkle with dry cake mix. Drizzle with butter; sprinkle with nuts.
Bake 30 to 35 min. or until center is set.
Microwave caramels and remaining milk in microwaveable bowl on HIGH 1-1/2 min. or until caramels are completely melted and sauce is well blended when stirred. Drizzle over cake.
Substitute 1 cup KRAFT Caramel Bits for the caramels.
Indulge in a treat occasionally and give yourself permission to enjoy it in moderation. Healthy eating is about making good choices the majority of the time.