Prepare Cake Base: Preheat oven to 350°F (175°C) and grease a 9×13-inch pan. Mix cake mix, melted butter, and one egg until dough forms. Press evenly into pan.
Make Pumpkin Filling: Beat softened cream cheese until smooth. Add pumpkin puree, eggs, melted butter, vanilla, and spices. Gradually mix in powdered sugar until creamy.
Assemble and Bake: Pour pumpkin mixture over cake base and spread evenly. Bake for 45–50 minutes, until edges are set but center jiggles slightly.
Cool and Serve: Let cool completely before slicing. Top with whipped cream, caramel drizzle, and pecans.
