Step 1

Preheat oven to 350°F. Prepare a 9x13 dish by spraying with nonstick spray.

Step 2

Make the cake according to the package directions for a 9x13 cake.

Step 3

When the cake is done baking use the round handle end of a wooden spoon and poke holes all throughout the cake.

Step 4

Pour the sweetened condensed milk all over the top of the cake and spread it out.

Step 5

Then pour the caramel sauce over the top of the cake and spread it out.

Step 6

Refrigerate the cake for at least two hours.

Step 7

Spread the Cool Whip on top of the cooled cake and sprinkle with chopped Heath bars.