Preheat oven to 350° F. Grease 9x13 pan and set aside.
Add Oreos to the bowl of a food processor and blitz until fine crumbs form. Stir together with melted butter. Using a buttered fingers, press evenly into prepared pan and set aside. {After I pressed it out, I used the bottom of a measuring cut to flatten it perfectly even. Totally optional!}
In large bowl, whisk pumpkin, condensed milk, eggs, cinnamon, nutmeg and salt together until uniform in color and smooth. Pour pumpkin mixture on top of crust and spread evenly.
Bake 40-45 minutes until center is set. Remove from oven and cool completely. Cut into squares and top with cream and crushed cookies. Serve.
Notes
*I enjoyed these chilled, but that is totally optional. Store any leftovers covered with plastic wrap in refrigerator.