Preheat the oven to 325°F / 163°C and crush 18 Oreo cookies into fine crumbs, then mix with melted butter and press into the bottom of a 9-inch springform pan.
Beat the cream cheese and sugar until smooth, then add eggs one at a time, followed by sour cream, vanilla extract, and heavy cream, mixing until just combined.
Chop the remaining 6 Oreo cookies into chunks and fold them into the cheesecake batter.
Pour the batter over the crust and bake for 55 to 60 minutes until the edges are set but the center still jiggles slightly.
Turn off the oven, crack the door open, and let the cheesecake cool inside for 1 hour to prevent cracking.
Refrigerate for at least 4 hours or overnight until fully chilled and firm before slicing.