Pumpkin Dump Cake is easier but this look delishhhh. PUMPKIN CRISP. Preheat oven to 350 degrees. Combine 15 ounce can of pumpkin,1 cup evaporated milk, 1 cup sugar, 1 teaspoon vanilla, 1/2 teaspoon cinnamon, and 1/2 teaspoon nutmeg. Sprinkle a box cake mix and chopped pecans over top. Pour one cup of melted butter. Bake for 60 minutes and top with whip cream.