In a mixing bowl, combine the Oreo cookie crumbs and melted butter until the mixture resembles wet sand.
Press the Oreo mixture firmly into the bottom of the 9-inch springform pan to create a crust. Make sure it's evenly spread and compact.
In another bowl, soften the vanilla ice cream at room temperature for about 10 minutes. Once softened, pour it over the crust in the springform pan and spread evenly.
Fold the roughly chopped Oreos into the softened ice cream and then smooth the top with a spatula.
Cover the springform pan with plastic wrap and freeze for at least 4 hours, or until the ice cream is firm.
While the ice cream cake is freezing, prepare the whipped cream. In a mixing bowl, beat the heavy whipping cream until it begins to thicken. Gradually add the powdered sugar and vanilla extract, and continue to whip until stiff peaks form.
Once the ice cream cake is fully frozen, remove it from the freezer and take off the springform pan. Spread the whipped cream on the top of the cake evenly.
Drizzle with chocolate syrup if desired, and optionally garnish with additional crushed Oreos.
Return the cake to the freezer for another 30 minutes to set the whipped cream.
Slice and serve the Oreo ice cream cake, and enjoy!