Preheat oven to 350°F and grease or line a 9x13-inch pan with parchment paper.
In a large bowl, combine the spice cake mix, pumpkin puree, oil, milk, eggs, vanilla, and cinnamon. Mix until smooth and creamy. Stir in the chopped pecans. Pour the pumpkin batter into the prepared pan and spread evenly.
In another bowl, beat together the softened cream cheese, melted butter, powdered sugar, and vanilla until smooth. Drop large spoonfuls of the cream cheese mixture over the pumpkin batter.
Use a knife or spatula to gently swirl the mixtures together, creating a marbled effect—but don’t overmix.
Sprinkle chocolate chips and extra pecans evenly over the top.
Bake for 45–50 minutes, or until the edges are set and the center is slightly gooey. The cake will appear cracked and uneven—that’s the signature “earthquake” look!
Cool completely before slicing. Serve warm or at room temperature.