Combine the cake mix, egg, and butter and mix well with an electric mixer. Pat the mixture into the bottom of a lightly greased 13 by 9-inch baking pan.
Prepare filling:
In a large bowl, beat the cream cheese and pumpkin until smooth.
Add the eggs, vanilla, and butter and beat together until combined.
Add the powdered sugar and pumpkin pie spice – mixing well.
Spread pumpkin mixture over cake batter and bake for 40 to 50 minutes. Do not over bake as the center should be a little gooey.