1Preheat an air fryer to 350 degrees F (175 degrees C).
2Halve and pit the peach, then place the halves flesh-sides down in the air fryer basket and cook.
3Melt the butter in a microwave-safe bowl in 15 to 30 second intervals, then stir in the brown sugar and cinnamon until dissolved (microwave further if needed).
4Flip the peaches flesh-sides up, brush the butter mixture over the tops, filling the pit cavities with any excess, and cook again.
5Cool the peaches and top each half with a scoop of vanilla ice cream.