Place chopped chocolate in a 2-cup glass measure or small microwave-safe bowl. Microwave, uncovered, on 70% power (medium-high) for 1 minute; stir. Microwave on 70% power for 1 to 2 minutes more, or until chocolate is melted, stirring every 15 seconds.
In a food processor bowl combine cheese, half-and-half, and vanilla. Cover and process until combined. Add melted chocolate while food processor is running. Process until well combined. Spoon into demitasse cups or small bowls. Serve immediately, or cover and chill for up to 24 hours. If desired, garnish with fresh berries and mint leaves.