Microwave 1 cup chocolate chips uncovered on High 1 to 2 minutes or until melted. In medium bowl, beat cream cheese with electric mixer until smooth. Beat melted chocolate into cream cheese. Beat 1 cup whipping cream with electric mixer on high speed until stiff peaks form. Fold whipping cream into chocolate-cream cheese mixture until well blended. Spread over cooled cookie base. Cover; refrigerate 1 hour or until set.