Preheat oven to 350 degrees F. Line a 13x9" baking pan with foil, extending the sides of the foil over the edges of the pan. Mist the foil with cooking spray and set aside.

In a large bowl, combine the cake mix, one (1) stick (1/2 cup) of the melted butter and one (1) egg together until blended; dough will be thick. Press evenly into the prepared pan and set aside.

Meanwhile, beat the cream cheese, pumpkin, pie spice and vanilla with a handheld electric mixer on medium speed until blended and creamy. Beat in the remaining 1/2 cup melted butter, & the remaining 3 eggs until blended. Lastly, beat in the entire pkg of powdered sugar.

Pour the mixture evenly over the bar base and bake for 45 minutes or until the center is just about set (slightly jiggly is okay). Cool completely, then refrigerate for at least an hour to set up. Store bars in fridge.