1 (20 oz.) can pumpkin 2/3 c. brown sugar 2 tsp. pumpkin pie spice 1 tsp. Cinnamon 2 eggs 2/3 c. milk
Mix cake mix, egg and butter. Press into 13x9 inch pan. Mix filling, pour over crust. Sprinkle with the reserved 1 cup cake mix and bake at 350°F. for 45-50 minutes.
When cooled, cake can be optionally topped with Cool Whip.