Preheat air fryer to 350°.
In a small bowl, cream together the brown sugar, cinnamon, and butter until well combined.
Place the peaches into the air fryer basket with the cut side up. Top each peach with a dollop of the butter and sugar mixture.
Cook the peaches in the air fryer for 7 to 12 minutes until the sugar is caramelized.
Serve immediately topped with vanilla ice cream or whipped cream.