Prepare the crust: In a medium bowl, combine the crushed Oreo cookies and melted butter. Mix until the crumbs are well-coated and resemble wet sand.
Form the crust: Press the Oreo mixture firmly into the bottom of a 9x9-inch baking dish to form an even layer. Use the back of a measuring cup for a smooth finish. Place in the refrigerator to chill while preparing the filling.
Make the cheesecake filling: In a large mixing bowl, add the softened cream cheese and beat with an electric mixer until smooth and creamy.
Add sweetness: Gradually add the powdered sugar and vanilla extract, mixing until well combined. Scrape down the sides of the bowl to ensure everything is incorporated.
Whip the cream: In another mixing bowl, whip the heavy whipping cream until stiff peaks form.
Combine the mixtures: Gently fold the whipped cream into the cream cheese mixture until fully blended without deflating the whipped cream.
Fill the crust: Pour the cheesecake filling over the chilled Oreo crust, spreading it evenly with a spatula.
Top it off: Place the mini Oreos on top of the cheesecake layer for added decoration and crunch.
Chill: Cover the baking dish with plastic wrap and refrigerate for at least 4 hours or overnight until firm.
Slice and serve: Once set, remove from the fridge, cut into squares, and serve. Enjoy your decadent Oreo cheesecake bars!