Preheat oven to 350°F. Grease a 13x9-inch baking dish and set aside.
In a large mixing bowl, combine the yellow cake mix, pumpkin pie spice, melted butter, pecans, and an egg. Stir until well combined.
Press the mixture evenly into the bottom of the prepared baking dish to form the crust layer.
In another mixing bowl, beat the softened cream cheese, pumpkin butter, and eggs until smooth.
Add pumpkin pie spice, flour, vanilla extract, powdered sugar, and melted butter. Beat until creamy and smooth.
Pour and spread the cream cheese mixture evenly over the crust in the baking dish.
Bake for 50-55 minutes, or until the center is just set.
Cool completely in the pan. Once cooled, dust with powdered sugar if desired. Cut into squares or bars and serve garnished as desired.