Warm 1/4 cup of the milk and stir in the coffee/espresso powder until dissolved.
In a bowl, whisk together the coffee mixture, remaining milk, heavy cream, sugar, vanilla, salt, and softened cream cheese until smooth.
Pour into a Ninja Creami pint container, staying below the max-fill line. Seal and freeze level for 24 hours.
Remove the lid, lock into the Creami outer bowl, and run the "Ice Cream" function.
If crumbly, add 1–2 tbsp milk and run "Re-spin" until smooth and creamy.
Optional: make a hole in the center, add mix-ins, and run "Mix-In."
Scoop and serve, or freeze 15–20 minutes for a firmer texture.