Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish like your life depends on it.
In a large bowl, mix the cake mix, 1/3 cup evaporated milk, and melted butter until thick and sticky like a cookie dough.
Press half that mixture into the pan and bake it for 8 minutes. Let it sit and think about its life choices.
While that bakes, melt the caramels with the second 1/3 cup of evaporated milk in a saucepan over medium-low heat, stirring constantly until smooth. Try not to eat it by the spoonful. No promises though.
Remove the base from the oven. Pour the caramel over it. Sprinkle chocolate chips like you’re a generous chocolate fairy.
Crumble the rest of the dough over the top, covering as much of the caramel as possible (but if some peeks through, we’re not mad about it).
Bake for another 18–20 minutes, then cool completely before cutting. Yes, completely. I know, the wait is cruel.