Pumpkin Pie Cake

This is my mom's recipe-its a family favorite and popular whenever I serve it! I have been getting lots of requests for this recipe so here it is.

Ingredients:

1-29 oz. pumpkin
1 can evaporated milk
2-3 tsp. pumpkin pie spice
3 eggs
1 C sugar (I only use about 2/3 C)

1 Dry Yellow Cake Mix

1/2-1/3 Cup Butter-frozen

Combine pumpkin, milk, spice, eggs and sugar, mix well then pour into well greased 9X13 pan. Sprinkle cake mix over pumpkin mixture. Grate butter over top. Bake uncovered at 350 about 1 hour or until cake pulls away from pan. Don't over cook. Serve with whipped cream or ice cream.