Preheat the Oven:
Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish and set aside.
Prepare the Pumpkin Filling:
In a large mixing bowl, whisk together the pumpkin puree, evaporated milk, eggs, sugar, cinnamon, nutmeg, and cloves until smooth. Pour the mixture into the prepared baking dish.
Add the Cake Mix Layer:
Evenly sprinkle the dry yellow cake mix over the pumpkin mixture, ensuring complete coverage.
Top with Nuts and Butter:
Sprinkle the chopped nuts evenly over the cake mix. Drizzle the melted butter evenly over the top to ensure the topping bakes into a golden, crispy layer.
Bake:
Place the baking dish in the oven and bake for 50–60 minutes, or until the edges are set and the top is golden brown. A toothpick inserted near the center should come out clean.
Cool and Serve:
Allow the cake to cool slightly before serving. Serve warm or at room temperature with a dollop of whipped cream or a scoop of vanilla ice cream, if desired.