Preheat oven to 350 degrees. Butter a 9 by 12 inch baking dish.
Put the apples in the prepared dish and spread into an even layer. Drizzle 1 cup of the caramel sauce over the apples. Sprinkle the cake mix evenly over the apples, making sure to completely cover them with the mix. Evenly drizzle the butter over the cake mix.
Bake the cake for 45 – 55 minutes or until golden brown and a toothpick inserted into the cake comes out clean. While the cake is still warm, drizzle the remaining ½ cup caramel sauce over the top of the cake. Serve the cake warm or at room temperature, topped with whipped cream or ice cream, if desired.
I used Kinnikinnick gluten free white cake mix. To make dairy free, use a dairy free caramel sauce and melted dairy free buttery sticks. If you use homemade salted caramel sauce, make sure you use unsalted butter (or dairy free equivalent).