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In 1-quart (1 L) saucepan, heat whipping cream over medium heat until hot (do not boil); remove from heat. Stir in chocolate chips until melted and smooth. Let stand about 5 minutes. Carefully pour chocolate mixture onto top center of cake; spread to edge, allowing some to drizzle down side. Garnish top of cake with toffee candy. Refrigerate about 1 hour or until chocolate is set. Store covered in refrigerator.