Pumpkin Cake

Ingredients
Crust:
1 pkg. yellow cake mix (reserve 1 c. for topping)
1 egg
1/2 c. margarine
Filling:
2 c. pumpkin puree
1/2 c. sugar
2 1/2 t. pumpkin pie spice
2 eggs
2/3 c. evaporated milk
Topping:
reserved 1 c. cake mix
1/4 c. margarine (cold)
1/4 c. brown sugar

Preheat oven to 350 degrees. Grease & flour 9x13 pan. Reserve 1 cup of cake mix from the package. In a bowl, combine remaining cake mix, 1 egg & margarine. Press mixture into the bottom & up the sides of the pan to form a crust.
Mix together the pumpkin, 2 eggs, sugar, pumpkin pie spice & evaporated milk until blended. Pour over the crust. Combine the brown sugar & reserved 1 c. cake mix, then cut in the margarine until crumbly. Sprinkle over filling.
Bake in preheated oven for 45 minutes. Serve warm with cool whip. Cover loosely (it'll get soggy if you don't)