- In a sizeable mixing bowl, thoroughly combine the yellow cake mix and pumpkin puree to achieve a consistent batter. 
- Transfer the batter into a suitably greased 9x13 baking dish. 
- Bake the mixture at a temperature of 350 F, adhering to the duration specified on the cake mix packaging, typically ranging from 23-28 minutes. 
- Once baked, allow the cake to cool for approximately 10 minutes. 
- Utilize the handle end of a wooden spoon to create uniform holes across the surface of the cake. 
- Evenly distribute the sweetened condensed milk over the cake, ensuring it permeates the holes and is absorbed by the cake. 
- Place the cake in a refrigerator and allow it to chill for a duration of 30 minutes. 
- After the refrigeration period, uniformly apply the Cool Whip on the cake's surface. Subsequently, garnish with Heath bits and an adequate amount of caramel sundae sauce. 
- For optimal results, refrigerate the cake for an additional 3-4 hours or let it set overnight.