Preheat oven to 350 degrees F. Line a 9x14 pan with foil or spray generously with cooking spray and set aside.

Combine the brownie mix, egg and butter in the bowl of your KitchenAid mixer and beat with the paddle attachment. The dough will be quite stiff!

Push half of the mixture into the bottom of the prepared pan.

Pour the sweetened condensed milk over the top, try to avoid the milk from touching the edges of the pan (pour towards the middle).

Sprinkle the chocolate chips evenly over the sweetened condensed milk.

Using the rest of the brownie mixture, break the remaining mixture and drop evenly over the top of the bars. Push down slightly.

Bake 28-29 minutes or until the top isn't jiggly (edges will appear done). Allow to cool for 20-30 minutes before slicing to allow the brownies to set up.