Mix the first five ingredients in the Ninja Creami pint container with an immersion blender. Be sure that they remain below the max fill line.
Freeze the container on a flat surface for at least 24 hours or until completely frozen solid.
Remove from the freezer, run under hot water for 30 seconds, and take off the lid. Place the container into the outer bowl of the Ninja Creami and lock the outer bowl lid into place.
Secure the outer bowl into the Ninja Creami machine. Press the Lite Ice Cream button and allow the cycle to complete.
If the ice cream looks powdery, add a splash of cream, then press the Re-spin button for a creamier consistency.
Make a small hole in the center of the ice cream and add peanut butter. Run the Mix-In function to swirl it through.
Top with chopped peanuts, a drizzle of melted dark chocolate or a sprinkle sea salt and enjoy!