Combine all the ingredients in the container of an electric blender; cover and process until smooth. Pour into a shallow baking dish; cover and freeze for 3 hours.
To serve, let stand at room temperature for 30 minutes or until slushy.
Per serving: 116 Calories; 0g Fat (1% calories from fat); 1g Protein; 21g Carbohydrate; 0mg Cholesterol; 0mg Sodium