Preheat the oven to 350 degrees.  Mix together the entire box of cake mix and the entire can of pumpkin until combined.  Drop the dough by spoonful onto an un-greased cookie sheet.  Place in the oven and bake for 10 min.  Allow to cool on wax paper before frosting.  Once cool, cut the cookies into the same size round shapes (I used the mouth of a white wine glass).  Then turn the cookies upside and frost their bottoms, and stick two together to make a sandwich!  These are the easiest cookies ever and make great non HP related treats too!