Preheat the oven to 350 degrees Fahrenheit
butter a 9x13 pan, or spray it with non-stick spray
Drain the canned yams from the juice and pour into a large mixing bowl
Mash the yams until there are no more chunks
Add the evaporated milk, brown sugar, pumpkin spice seasoning and eggs to the yams
Whisk together or use a hand mixer to blend these ingredients together until combined and smooth
Pour this mixture into the prepared baking dish
Sprinkle the dry cake mix over the top of the sweet potato mixture, do not mix
Pour the melted butter all over the top of the cake mix
Sprinkle the top with the chopped pecans
Bake in the oven for 50-60 minutes or until a toothpick inserted comes out clean, the center should no longer jiggle; it is normal if the toothpick has yam residue.
Remove from the oven and let cool for 10 minutes
Serve warm with your favorite ice cream or whipped cream, you can also serve it cold