1 large can of pumpkin (straight pumpkin...not the pumpkin mix)
1 cup evaporated milk
1 cup brown sugar
1 cup white sugar
3 eggs
1/2 tsp. pumpkin pie spice
yellow cake mix
1 stick melted butter
Mix first six ingredients together until well blended. Pour into a 9 x 13 pan. Stir in a DRY yellow cake mix. You can stir most lumps out, but not all of them. Don't sweat it. When cake mix is thoroughly mixed in, pour your melted butter on the top.
Bake in a preheated oven at 350 degrees for 55-60 minutes.