Add cream cheese and liquid sweetener to a mini blender or food processor bowl, and blend until smooth. Transfer the mixture to a small bowl.
Add the remaining cream cheese, the egg and granulated Splenda to the blender bowl, and whiz until smooth. Pour into a microwave-safe shallow round dish.
Cook for 1 minute, and it will start to puff up.
Spoon the first cream cheese mixture into the center of the dish. Cook again for 20-30 seconds.
Spoon a small amount of fruit sauce over the top (if using), and serve warm.