Place the quartered peaches directly into the Ninja Creami pint container. Pour in the half and half, milk, maple syrup, and vanilla extract.
Use a spoon to stir everything together in the pint. Make sure the liquids are mixed and the peaches are distributed evenly throughout. It doesn't need to be perfectly smooth.
Seal the pint with the storage lid. Place it on a flat, level surface in your freezer and freeze for a minimum of 24 hours until completely solid.
Remove the pint from the freezer and take off the lid. Place the frozen pint into the outer bowl of your Ninja Creami. Attach the creamerizer paddle and lock the lid assembly. Insert into the machine and select the "Ice Cream" function. Allow the cycle to complete.
After processing, check the consistency. If the ice cream appears dry or crumbly, create a small well in the center and add 1 tablespoon of milk. Select "Re-Spin" and process again. Repeat once more if needed for a smooth, creamy texture.
Your peach ice cream is ready to eat. Scoop into bowls or cones and enjoy right away.