I got this recipe from a coworker at my first "real" job. Ten years later, it is still a favorite at our house and among my friends!
3 beaten eggs
1 large can pumpkin puree
1 cup sugar
1 cup evaporated milk
3 teaspoons pumpkin pie spice
1 teaspoon salt
1 box yellow cake mix
1-1/2 sticks butter, cut into pats
Preheat oven to 350. Mix eggs, pumpkin, sugar, milk, pumpkin pie spice, and salt. Pour into greased 9x13 pan. Top with dry cake mix and cover with pats of butter. Bake 50 minutes. Serve warm with vanilla ice cream or whipped cream.