Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking dish.
In a large mixing bowl, whisk together the pumpkin puree, evaporated milk, eggs, granulated sugar, brown sugar, pumpkin pie spice, and salt until smooth.
Pour the pumpkin mixture evenly into the prepared baking dish.
Sprinkle the dry yellow cake mix evenly over the top of the pumpkin layer.
Drizzle the melted butter evenly over the cake mix, then sprinkle with chopped pecans.
Bake for 55 to 60 minutes, or until the top is golden brown and the center is set. Let cool before serving.
Notes
Serve warm with a scoop of vanilla ice cream or a dollop of whipped cream for the perfect fall treat!