Preheat oven to 350º F and grease a 9 x 13 inch baking dish
In a large mixing bowl combine the pumpkin puree, sugar, eggs, evaporated milk, salt and pumpkin pie spice. Mix with an electric mixer until well combined.
Pour the pumpkin mixture into the prepared baking dish.
Sprinkle the yellow cake mix over the top of the pumpkin mixture. Use a knife to swirl the cake mix with the pumpkin mix, don't mix together completely.
Pour the melted butter over the top of the cake mix.
Bake for 50-60 minutes, until golden brown. Allow to cool for about 10 minutes before slicing.
Notes
Nutrition facts are just an estimate.
Store any leftover cake covered or in an air tight container for up to 4 days on the countertop