Preheat oven to 350 degrees F.
Using a wooden spoon or the paddle attachment on your stand mixer, combine egg, butter, water and cookie mix. Roll finished cookie dough into a large ball, wrap tightly and place in the fridge for 30-60 minutes.
In a large bowl, combine egg, butter, water and brownie mix. Pour mix into lightly greased skillet and bake for 22 minutes.
Remove brownies from the oven and set aside.
On a lightly floured surface, roll cookie dough out into a skillet-sized disk (approximately 1/4 inch thick) and center it on top of the brownie layer. Bake for another 15-20 minutes or until cookie layer is golden brown and crispy.
Serve a scoop of this skillet while it’s still hot! Add a scoop of ice cream and grab a spoon for a next-level treat.