Spiced Pumpkin Dessert

1 pkg yellow cake mix
1 30-oz can pumpkin pie mix
2/3 cup milk
0.5 cup butter
3 eggs
1 cup reserved crumbs
1 tsp cinnamon
1/4 cup sugar
2 Tbsp butter
whipped topping

Cut butter into cake mix until crumbly. Mix in 1 egg. Reserve 1 cup of crumbs. Press remaining crumbs into ungreased 9x13 pan. Blend pie mix, milk and 2 eggs; pour over crumbs in pan. Sprinkle topping over pumpkin.

**Topping:**
Mix reserved crumbs, sugar, cinnamon, and butter.

Bake at all at 350 degrees for 45 minutes. Served with whipped topping.