Add all ingredients excepts Oreos to a blender. Blend until smooth.
Pour into Ninja Creami container and freeze on a level surface for at least 18 hours.
Remove from the freezer and process on the ice cream setting. If needed, add a splash of milk and respin.
Create a well/hole in the center of the ice cream pint. Chop up 3 Oreos into 6 pieces each. Add to the well in the center of your Ninja Creami. Process on the mix-in setting.
Scoop out and enjoy!
Notes
If you want even more peanut butter flavor, use ⅓ cup peanut butter instead of ¼ cup.
For a less sweet version, use 2 Tablespoons sugar instead of ¼ cup sugar.
If you have leftovers, smooth out the top and return to the freezer.
You can of course use different mix-ins with this recipe! Chopped Butterfingers or peanut butter cups would be delicious.
You can substitute cottage cheese for the ricotta. Just make sure it is a low-acid cottage cheese and not tangy, otherwise your ice cream will have more tangy cheesecake flavor vibes.