In a blender, add all "Ice Cream Base" ingredients and blend until smooth.
Pour the blended mixture into your Ninja Creami pint and freeze on a level surface for at least 24 hours.
Once fully frozen, take the pint out of the freezer. Run it under hot water on all sides including the bottom for 1-2 minutes.
Spin on Lite Ice Cream mode.
Respin 1-2 times until it becomes smooth and creamy.
Use a spoon to create a hole in the center (if one hasn’t naturally formed).
Add 5 Oreo halves and most of the rainbow sprinkles, saving some for topping. Spin on Mix-In mode.
Crush the remaining 1 Oreo half over the top, sprinkle the rest of the rainbow sprinkles, and enjoy!