Step 1: In a medium bowl, combine the crushed Oreo cookies and melted butter. Stir until the crumbs are evenly coated. Press the mixture firmly into the bottom of a 9-inch springform pan and refrigerate while preparing the filling.
Step 2: In a large mixing bowl, beat the softened cream cheese and powdered sugar together until the mixture is smooth and free of lumps.
Step 3: Sift the matcha powder into the cream cheese mixture and add the vanilla extract. Beat on low speed until the color is uniform and the matcha is fully incorporated.
Step 4: In a separate chilled bowl, whip the heavy cream until stiff peaks form. Gently fold the whipped cream into the matcha cream cheese mixture in three stages until no white streaks remain.
Step 5: Pour the filling over the prepared Oreo crust and smooth the top with a spatula. Cover with plastic wrap and refrigerate for at least 6 hours, or preferably overnight, before serving.