Slice one of the peaches and puree with an immersion blender.

Add heavy whipping cream and granulated sugar, and blend or whisk until sugar is dissolved and everything is combined.

Pour mixture into a Ninja Creami pint container, fasten with the corresponding lid, and place on an even surface in your freezer overnight, or at least 10 hours.

When you're ready for ice cream, remove the pint container from the freezer and allow it to sit on the counter for 5 minutes to soften the edges.

Process on the ice cream setting. If the mixture is crumbly, add a splash of cream or milk and use the re-spin button.

Meanwhile, chop the second peach into small pieces. Once the ice cream has been processed, add the chopped peach to the center of the ice cream in the pint container, and use the mix-in button.

Serve immediately, adding freshly whipped cream and more fresh peaches if you want!

Freeze any leftovers by smoothing into an even layer in the original pint container, and process using the steps above at a later day.