In a food processor, pulse 30 Oreo cookies until finely ground. Add melted butter and pulse until combined.
Press the Oreo mixture firmly into the bottom of a 9x13 inch baking pan lined with parchment paper.
In a large bowl, beat the softened cream cheese and granulated sugar with an electric mixer until smooth and creamy.
Gradually pour in the heavy cream and vanilla extract, continuing to beat until well combined.
Gently fold in 15 coarsely chopped Oreo cookies into the cream cheese mixture.
Pour the cheesecake filling over the prepared Oreo crust, spreading it evenly with a spatula.
Cover the pan with plastic wrap and refrigerate for at least 4 hours, or preferably overnight, to allow the cheesecake to set completely.
Once set, lift the Oreo cheesecake bars out of the pan using the parchment paper overhang. Cut into squares and serve.