Combine crumbs and butter; press into bottom of a 9- or 10-in. springform pan. Freeze. Whip 1-1/2 cups whipping cream until stiff peaks form; refrigerate.
In a large bowl, beat cream cheese until smooth. Gradually add sugar; blend thoroughly. Fold cut cookies into filling along with chilled whipped cream. Spread filling evenly into crust, smoothing top and spreading to edges. Cover and refrigerate 4 hours or overnight. Freeze 1 hour before serving.
Meanwhile, melt chocolate in a saucepan over low heat, stirring constantly. Remove from heat; cool slightly. Whisk in vanilla and remaining 1/2 cup whipping cream. Loosen cheesecake from pan by running knife around edge; remove from pan.
Spread chocolate glaze over cheesecake. If desired, top with whipped cream and additional Oreo cookies to serve.
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