Diane's Pumpkin Delight

1 package Duncan Hines deluxe yellow cake mix with 1 c. removed
1/2 cup melted butter
1 egg
Mix together and put into greased and floured 9x13 pan. Press firmly.

In a bowl mix the following:
1 large (30oz.) can pumpkin pie mix
2 eggs, slightly beaten
1 can evaporated milk (1 1/2 c. plus 2 Tablespoons)

Mix and crumble on top:
1/4 cup sugar
1 teaspoon cinnamon
1/4 c. cold butter (do not melt) 1 c. reserved cake mix

Bake at 350 for 50 to 60 minutes. Test doneness with a knife. Don't store covered. Cut into squares and serve with whipped cream