In small microwavable bowl, microwave remaining 1/2 cup chocolate chunks uncovered on High 1 minute; stir until smooth. Stir in reserved 1/4 cup whipping cream until smooth. Run thin, flexible spatula around side of pan to loosen torte; remove side of pan. Spoon warm chocolate mixture over top of mousse, allowing some to drizzle down sides. Smooth top of torte with thin, flexible spatula. Refrigerate 30 minutes or until serving.