Preheat oven to 350F degrees. Spray 9x13-inch baking dish with nonstick cooking spray.
In a medium bowl, combine 15.25 ounce box Devil's Food chocolate cake mix, 1 cup evaporated milk and 1/2 cup (1 stick) butter, melted. Mix until combined (batter will be thick).
Spread HALF of the batter into the baking pan (we'll use that other half later so just set it aside for now).
Put baking dish in the oven and bake for 15 minutes. While it is baking, start making your caramel filling.
In a medium sauce pan, over medium heat, combine 11 ounce bag caramels, unwrapped with 1/3 cup evaporated milk. Stir frequently until caramel is melted and smooth.
When brownie bottom is finished baking (it will only be partially baked), take out of oven and sprinkle with 2 cups semi-sweet chocolate chips.
Then drizzle with prepared caramel sauce.
Take the remaining half of the cake batter and drop by the teaspoonfuls onto caramel layer.
Bake for an additional 25-30 minutes (until the center is set). You can stick a toothpick in the center and if it only comes out with caramel and not gooey chocolate cake then it is done.
Allow to cool then slice and serve!
Video
Notes
Use any chocolate cake mix you enjoy. I like Devil's Food flavor but any chocolate flavor will work.
Some of the boxed cake mixes are getting smaller in size. Try to use Duncan Hines or Pillsbury as they are still the 15.25 ounce size. Betty Crocker has shrunk to 13.25 ounces and I am not sure that would work with this recipe.
These brownies can be stored in the freezer, in an airtight container for up to 3 months.