Make the crust: Pulse 24 Oreo cookies in a food processor until finely ground. Alternatively, place in a zip-lock bag and crush with a rolling pin.
Mix the Oreo crumbs with 4 tablespoons melted vegan butter until all crumbs are wet and the mixture holds together when pressed.
Line the bottom of an 8-inch springform pan with parchment paper. Press the mixture firmly into the bottom and about 1 inch up the sides using the flat bottom of a measuring cup.
Freeze the crust for 15-20 minutes while you make the filling.
Make the filling: Beat 24 oz softened vegan cream cheese with a mixer until completely smooth, about 2 minutes. Scrape down the sides as needed.
Add 3/4 cup powdered sugar and beat until combined. Add 1 tablespoon vanilla extract and beat until smooth.
Gently fold 1 cup dairy-free whipped cream into the cream cheese mixture using a spatula. Do not overmix or the whipped cream will deflate.
Fold in 10-20 roughly chopped Oreo cookies.
Spread the filling evenly over the chilled crust and smooth the top with an offset spatula.
Top with 8-12 roughly chopped Oreo cookies and any other desired toppings.
Cover and refrigerate for at least 4 hours, or overnight for cleanest slices.
To serve, run a thin knife around the edge of the pan, release the springform ring, and transfer to a serving plate. Cut into 8 slices.