Add cottage cheese, milk, sugar, peanut butter, and vanilla extract to a blender. Blend until combined. Pour into Ninja Creami container.
Freeze for at least 24 hours.
Remove Creami container from freezer and run warm water along the outside to slightly thaw the outer layer.
Process on the Light Ice Cream setting. If crumbly, add a splash of milk and respin.
Make a well/hole in the middle of the ice cream and add 2 Tablespoons of chopped chocolate pieces. Use the Mix In setting on the Creami to incorporate the chocolate.
Add additional 1 Tablespoon of chopped chocolate on top if desired.
Notes
If you want to make this in the Creami deluxe, multiply all ingredient amounts by 1.5.
If your peanut butter cup ice cream is too soft after adding the mix-ins, place in the freezer for 15-20 minutes to harden before scooping.
If you have leftovers, smooth out the top and refreeze. You may need to reprocess the ice cream before enjoying again.
Make sure to use a cottage cheese that isn't tangy. Certain brands are more tangy than others. Otherwise, you'll have peanut butter cheesecake vibes (which isn't bad either!)