Preheat oven to 325º. Place a large shallow pan of water in bottom of oven. For crust, lightly grease 10-inch springform pan with vegetable pan spray. In food processor, grind cookies until fine. Combine cookie crumbs with melted butter and sugar; press into bottom and up sides of pan. Bake 8 minutes; cool completely.
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Lower oven temperature to 250°F. In mixer bowl, beat cream cheese and sugar until light and fluffy. Beat in eggs one at a time, scraping often. Beat in sour cream, vanilla and cornstarch until mixture is smooth. Place 3 cups of the batter in a small bowl; stir in melted chocolate until well blended. Using large scoop, alternately scoop plain and chocolate batters over crust. Use a wooden pick to swirl together, forming a marble effect.
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