Preheat oven to temperature stated on cake mix box. Grease a 9” x 13” baking dish.
In a large bowl, combine cake mix, egg white and diet soda.
Bake as directed on box. (Diet soda cake takes less time to bake than regular cake, so check after 20 minutes for doneness).
During the last few minutes of baking, place caramel and condensed milk in a saucepan. Heat over medium heat, stirring until smooth.
Take cake out of oven, and poke holes all over the top. Pour caramel mixture over warm cake, filling in the holes.
Sprinkle Heath bits over the top, reserving some for the top. Cool completely.
Cover with Cool Whip and sprinkle with remaining heath bits.
Keep cool in fridge until ready to serve.
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