Preheat the oven to 350°F degrees. Line an 8x8 baking dish with parchment paper, set aside.
Place 12 of the Oreos in a food processor and process them into crumbs. Drizzle in the butter and pulse a few more times until the crumbs are coated. Press the mixture into the bottom of the prepared baking dish. Air fry at 320 degrees F for 3-5 minutes, and set aside to cool while the filling is made.
Place the cream cheese, sugar, sour cream, egg, and vanilla into the food processor. There is no need to clean the food processor between making the crust and filling. Pulse until combined and creamy. Add the white chocolate chips and pulse a few times to distribute them evenly.
Pour this mixture over the crust and smooth out the top. Bake for 15-18 minutes, at 300 degrees F, or until the cheesecake is slightly jiggly right in the center.
While the bars are air frying, roughly chop the remaining 8 Oreos. When they are done cooking, sprinkle the remaining Oreos on top and gently press them into the cheesecake. Let sit on the counter until completely cool, and then cover with plastic wrap. Let sit in the refrigerator for at least 3 hours until set.
Cut into bars and drizzle with the melted white chocolate wafers if using; let them sit for about 15 minutes for the white chocolate to harden, and serve immediately.