Add the milk, cream cheese, protein powder, powdered sweetener, vanilla extract, and salt to a blender
Blend well until the mixture is completely smooth and the cream cheese has fully dissolved.
Pour the mixture into a Ninja Creami pint container and secure the lid.
Freeze for 24 hours, ensuring the pint is completely solid before spinning.
Install the frozen pint into the Ninja Creami machine and run the Lite Ice Cream cycle.
If needed, add 1-2 tablespoons milk and run the Mix-In cycle until creamy.
Scoop and serve immediately.