Preheat the oven to 350°F (175°C). Grease a 9x13-inch baking pan with cooking spray.
Layer apple pie filling across the pan base. Drizzle caramel sauce evenly over apples. Sprinkle cake mix uniformly, then drizzle melted butter equally. Finally, sprinkle walnuts on top.
Bake until the cake is golden and the apple filling bubbles up, about 50 to 55 minutes. Let it cool for at least 15 minutes before serving.
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