In medium bowl, combine cake mix, egg and 1/2 cup melted butter with a wooden spoon until a soft dough forms. press evenly, into the bottom of a 9x13 inch cake pan. set aside.
In the bowl of your stand mixer, blend the cream cheese and pumpkin puree until smooth and combined. be sure to scrape the sides down occasionally.
Add the melted butter, eggs and vanilla and blend until combined again.
With the mixer running slowly add the pumpkin pie spice and gradually add the powdered sugar until completely blended. pour over prepared crust.
Bake for 45-50 minutes or until outer edges are set and the middle is still soft set. don't let it firm up 100%, you still want it slightly gooey in the center.
Let cool at room temperature and serve with whipped cream.
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