In a large bowl whisk together the pumpkin puree, evaporated milk, eggs, sugar and cinnamon until smooth and well combined
Pour in pumpkin mixture into a greased 9X13 dish
Evenly sprinkle the dry cake mix over the top of the pumpkin mixture
Take 2 sticks of butter and melt them in the microwave for about 20 seconds
Drizzle the melted butter evenly over the cake mix
Add chopped walnuts or pecans if you desire, or you can do half like I demonstrated in my video
Bake at 350 for 55-60 minutes until done. Should be golden brown crisp on top.
Let cool on the counter for at least an hour and cover and place in fridge
Slice and serve with whipped cream
Video
Notes
You can also enjoy this Pumpkin Dump Cake warm with vanilla ice cream. I have had it both ways chilled with whip cream and hot with vanilla ice cream. Both are wonderful!