Preheat oven to 350 degrees. Grease two 9 inch pie plates generously with some butter. You can use cooking spray, but butter will give the crust even more flavor. if using a store bought crust, just set them on a rimmed baking sheet and get ready!
Whisk together pumpkin, evaporated milk, eggs, sugar, and pumpkin pie spice in a medium bowl. Pour into greased pie plates or graham shells distributing evenly.
Put the cake mix in a bowl and pour in melted butter, stirring until mixture is crumbly. Sprinkle evenly over the pumpkin mixture, then drizzle on the remaining butter. Alternatively, mix the cake mix with SOFTENED butter to make a very soft and crumbly dough. Sprinkle over top of the pumpkin mixture, then sprinkle pecans on top.
Bake for 50 minutes or until golden brown.
Let cool to room temperature and then chill until ready to serve. To serve, bring back to room temperature.
Slice and serve with whipped cream or ice cream.