Prepare the springform pan. Cut out a circle of parchment paper to fit in the bottom of the pan.
Spray the sides of your springform pan as well as the bottom, with nonstick spray.
Place the parchment paper circle on the bottom of the pan and spray it lightly as well. Set aside.
Prepare the cookie crust by placing 24 cookies in the bowl of a food processor and pulsing them until they are uniform crumbs. Place the remaining cookies in a Ziploc bag and hit them with a rolling pin to create slightly larger crumbs, but no big pieces. See Tips & Tricks for more details about varying the texture of the crust.
Pour the cookie crumbs into a medium mixing bowl.
Put the 5 tbsp of butter in microwave safe dish and melt in the microwave. Start out with 30 seconds.
Add the butter to the cookie crumbs and blend together with a fork.
Pour the cookie crumbs into the prepared springform pan.
Press down the crumbs firmly but gently, spreading them along the bottom and a tiny bit up the sides of the pan. You can use the bottom of a measuring cup to smooth out the crumbs. For best results, don't press very hard (jamming the crumbs against the pan) or you may have a hard time cutting it later. Set aside.
Prepare the whipped cream by pouring the heavy whipping cream into the bowl of a stand mixer fixed with the whisk attachment.
Beat the cream on medium high until stiff peaks form in the cream. This means that if you remove the attachment from the mixer, the cream stays firm. NOTE: If you over mix cream, you will end up with butter, so be sure to check regularly.
If you only have one mixing bowl, gently move the whipped cream to a large mixing bowl.
Replace the whisk with the paddle attachment.
Blend together the cream cheese and powdered sugar on low speed until completely smooth.
Add the sour cream and mix until blended. Use a rubber spatula to scrape down the sides of the bowl and up from the bottom.
Add the brown sugar, pumpkin, and spices and mix to combine.
Gently fold the whipped cream into the cheesecake mixture using the spatula.
Pour the completed cheesecake mixture into the springform pan and smooth out evenly over the crust. You can use a small offset spatula or the back of a tablespoon.
Cover with plastic wrap and chill your No Bake Pumpkin Cheesecake & Pumpkin Spice Oreo Crust at least 8 hours until firm.
When the cheesecake is firm, remove it from the fridge and drag a sharp knife or offset spatula between the cake and the edge of the pan. Open the latch and carefully remove the ring.