In small saucepan, sprinkle unflavored gelatin over cold water; let stand 1 minute. Stir over low heat until gelatin is completely dissolved (about 3 minutes). Remove from heat and let stand until lukewarm (about 1 minute). In blender or food processor, process ice cream, whipping cream, 10 cookies, and vanilla until blended. While processing, through feed cap, gradually add lukewarm gelatin mixture and process until blended. Let stand until mixture is slightly thickened, about 5 minutes. Meanwhile, coarsely crush remaining 12 cookies. In parfait glasses or dessert dishes, alternately layer gelatin mixture with crushed cookies; chill until set, about 2 hours. Garnish if desired, with whipping cream and additional cookies. Makes about 6 servings.
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