Preheat the oven to 350 degrees. Grease a 9x13 baking dish with cooking spray.
In a large bowl add pumpkin, eggs, sweetened condensed milk, brown sugar, and pumpkin spice, Mix all ingredients together until smooth.
Spread the pumpkin mixture evenly into the bottom of the baking dish.
In a medium-sized bowl, stir together the cake mix and melted butter until the mixture until it looks like thick sand. Sprinkle the cake mix and butter mixture over the top of the pumpkin in the baking dish.
Bake the pumpkin cake in the oven for 50 to 60 minutes until cooked through. The cake crumbles on top will turn a golden brown.
Let the pumpkin cake to cool completely, at least thirty minutes..Then slice and serve. Top with chopped pecans, whipped cream and extra cinnamon if desired. Enjoy!
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Notes
You can use one large 29 ounce can of pumpkin puree for this recipe or two 15 ounce cans of pumpkin. If using fresh pumpkin puree use 3 1/2 cups.