Mix all ingredients in a Ninja Creami pint cup. Cover and freeze for at least 24 hours.
When ready to serve, use the "ice cream" button on the Ninja Creami to process the ice cream. You should only need one spin to process the ice cream; if you need another one, add ¼ cup milk and use the re-spin button.
Serve immediately.
Notes
Don’t fill the pint container past the "max" line.
Batch prepping? Buy extra pint containers and label the flavors.
For mix-ins (candy, cookies, chips): add them after the first spin and use the "mix-in" function instead of "re-spin."
Leftovers can be refrozen; just cover with the lid and pop in the freezer. When you're ready to serve again, spin once on ice cream mode. I don't recommend doing this more than once!
If your ice cream is too firm after the first spin, add a generous splash of milk and use the respin button to soften it up.