1 pkg. yellow cake mix (reserve 1 c. for topping)
1/2 c. melted butter
1 egg

FILLING:

3 c. pumpkin mix (Libby's 14 oz. can)
2 eggs
2 c. milk
1 tsp. pumpkin pie spice

TOPPING:

1 c. reserved cake mix
1/4 c. sugar
1/4 c. softened butter
1 tsp. cinnamon

Grease 9 x 13 inch pan. Combine cake mix, butter and egg. Pour into pan. Prepare filling. Pour over crust. Make topping and sprinkle over filling. Bake at 350 degrees for 1 hour and 15 minutes plus until done. Serve with Cool Whip.