Greer thinks this cake may be better than Robert Redford but not George Clooney. Just her opinion, of course.
Preheat oven to 350 degrees (F) and spray a 9 x 13-inch baking dish with nonstick spray.
Prepare the cake mix according to the directions on the package, but use milk in place of water.
Pour the batter into the baking dish and bake according to the package directions.
Let the cake cool.
Using the handle of a wooden spoon, poke holes throughout the cake.
Pour the whole can of sweetened condensed milk over the caking, filling the holes.
Drizzle the cake with half of the jar of salted caramel sauce.
With an electric mixer, whip the whipping cream until stiff peaks form, adding the powdered sugar and vanilla while whipping.
Spread the whipped cream over the cake.
Drizzle with the remaining salted caramel sauce and sprinkle with bits of Heath candy pieces (small chunks, but not crushed).
You can use frozen whipped topping, but make sure it's completely thawed before you put it on the cake.