1 pkg. Yellow cake mix (reserve 1 cup) You can also try it with Spice cake mix.
1/2 C. butter or margarine (room temperature)
Mix & press into greased 9x13 pan.
1 Lg can Libby pumpkin pie mix (make sure it says "mix", not just the regular pumpkin)
2/3 C. Evaporated milk
1 C. Reserved cake mix
1/4 C. Sugar
1/4 C. Butter or Margarine, room temperature
1 tsp Cinnamon
Mix & sprinkle over pumpkin mixture (also very sticky)
Bake at 350 for 45-50 minutes till toothpick comes out clean.
Chill, and serve with whipped topping.