Preheat your oven to 350°F (175°C). This ensures the brownies bake evenly and perfectly.
Line your 9x13 inch baking pan with parchment paper, leaving some overhang for easy removal later. Lightly grease the parchment paper for added assurance.
In a double boiler or a microwave-safe bowl, combine the 12 ounces of caramels and 5 ounces of evaporated milk (set aside 1 ounce for later). Heat gently until the caramels are completely melted and smooth, stirring frequently to avoid burning.
In a large mixing bowl, combine the melted butter with the German chocolate cake mix. Stir until fully incorporated. Add the remaining 4 ounces of evaporated milk and mix until the batter is thick and smooth.
Pour half of the brownie batter into the prepared baking pan. Spread evenly using a spatula. Next, pour the melted caramel mixture over the brownie layer, spreading it to cover the batter completely.
Carefully dollop the remaining brownie batter over the caramel layer. Use a spatula to spread it gently, but don’t worry if there are some gaps—this will create a marbled effect.
Sprinkle the chocolate chips evenly over the top of the brownies. This adds an extra layer of chocolatey goodness.
Place the baking pan in the preheated oven and bake for 25 to 30 minutes. The edges should be set, and a toothpick inserted in the center should come out with a few moist crumbs.
Allow the brownies to cool in the pan for about 10 minutes before lifting them out using the parchment paper overhang. Let them cool completely on a wire rack before cutting into squares. Enjoy your rich, indulgent Chocolate Caramel Brownies!