Pumpkin Recipe

I found this recipe in one of my ward cookbooks recently. It sounds pretty tasty and so I think I am going to make it so I can take it to my brothers house for Thanksgiving dinner this year. The only change that I plan on making to it is that I am going to add some type of nuts, probably pecans, to the topping. I'll let you know how it goes. Happy Thanksgiving!

World's Best Pumpkin Cake

Crust:
1 pkg. yellow cake mix (reserve 1 cup)
1 egg beaten
½ c. margarine, melted

Filling:
1 (1 lb.) can pumpkin
1 c. sugar
½ c. milk
2 eggs beaten
2 ½ t. pumpkin pie spice

Topping:
1 c. cake mix (reserved from crust)
½ c. sugar
¼ c. margarine, softened

Mix crust ingredients together and pat dough into a 9x13 cake pan. Mix filling ingredients and pour over dough. Blend topping and sprinkle evenly over filling, Bake at 350 for 50-55 min. Cool, top with whipped cream and serve.