Microwave chocolate and whipping cream in a 2-quart microwave-safe bowl at MEDIUM (50% power) 3 1/2 minutes (do not boil). Whisk until mixture is smooth.
Place bowl in a pan of ice water; let stand 10 to 15 minutes or until very cold, stirring often. Remove from ice water, and beat at medium speed with an electric mixer just until soft peaks form. Chill until serving time.