Add cottage cheese, milk, cocoa powder, sugar, and peppermint extract to a blender. Blend to combine.
Pour into the Ninja Creami container and freeze for at least 18 hours on a level surface.
Remove from the freezer and process on the ice cream setting. Add a splash of milk and respin 1-2 times.
Top with crushed/shaved chocolate and crushed peppermint pieces.
Notes
Run a little warm or hot water along the outside of your Creami container before processing. This will allow the outer layer to thaw a bit.
If you have leftovers, smooth out the top and return to the freezer. You will likely need to reprocess or leave on your counter for a bit to thaw before scooping out and enjoying again.
Get creative! While this makes an excellent peppermint bark ice cream, you can top your ice cream however you want or just enjoy without toppings for a delicious chocolate peppermint ice cream.
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.
Note that the nutrition calculation for this recipe does not include the toppings, as that will depend on what/how much you add.