Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or cooking spray.

Mix together the pumpkin puree, evaporated milk, granulated sugar, brown sugar, eggs, pumpkin pie spice, and salt in a large bowl until smooth.

Pour the pumpkin mixture into the prepared baking dish, spreading it evenly.

Sprinkle the dry cake mix generously over the pumpkin mixture.

Add the chopped pecans on top of the cake mix.

Drizzle the melted butter evenly over the surface.

Bake the cake for 50–60 minutes until golden brown and set in the center.

Cool the cake for 15–20 minutes before serving.

Serve with a dollop of whipped cream or a scoop of vanilla ice cream, if desired.

Store any leftovers in the refrigerator or freeze individual portions for later enjoyment.