Preheat the oven to 350º Fahrenheit and grease a 9x13 pan with butter or cooking spray.
In a large bowl, whisk together the pumpkin, milk, eggs, sugar, salt, cinnamon and pumpkin pie spice until well blended. Make sure the eggs are fully incorporated.
Pour the pumpkin batter into the prepared pan.
Sprinkle the dry cake mix over the pumpkin.
Drizzle with the melted butter.
Sprinkle the pecans on top. Then sprinkle the brown sugar over the pecans.
Bake for 1 hour or until a knife inserted in the center comes out clean.
Check the cake at about 45 minutes while baking. If it is getting too brown, cover with foil for the remainder of baking.
Serve warm with ice cream or whipped cream.
Store any leftover cake covered in the refrigerator.
The calories shown are based on the cake being cut into 9 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**