01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan.
02 - In a large bowl, whisk together pumpkin puree, sweetened condensed milk, eggs, pumpkin pie spice, granulated sugar, and salt until smoothly blended.
03 - Pour pumpkin mixture into the prepared baking pan and spread into an even layer.
04 - Evenly sprinkle the dry yellow cake mix over the pumpkin layer without mixing.
05 - Drizzle melted butter evenly over the entire surface of the cake mix, ensuring maximum coverage.
06 - Distribute chopped pecans across the top, if desired.
07 - Bake for 45 to 55 minutes, or until the surface is golden brown and the center is set. The dessert will continue to solidify as it cools.
08 - Allow to cool for at least 30 minutes before slicing. Serve warm or chilled, optionally topped with whipped cream or vanilla ice cream.