Add all ingredients to a Ninja Creami container. Stir, then freeze on a level surface for at least 18 hours.
Remove from the freezer. Run a little warm water on the outside of the container for 30 seconds to thaw the outer layer.
Process on the Light Ice Cream setting. If powdery or crumbly, add a splash of milk and respin.
Notes
I like to run a little warm water along the outside of the container for 30 seconds before processing. This helps the outer layer to thaw slightly.
If you have leftovers, simply smooth out the top and return to the freezer. You may need to reprocess before enjoying again.
As with any recipe using cottage cheese, if you don't want it to have a tangy flavor, make sure your cottage cheese is fresh and choose a brand that doesn't make tangy cottage cheese.