Preheat air fryer to 350°F (175°C).
In a small bowl, whisk together melted butter, brown sugar, cinnamon, vanilla extract, and salt.
Brush the cut side of each peach half evenly with the butter mixture.
Place peach halves in the air fryer basket, cut side up.
Air fry for 8 to 10 minutes until peaches are soft and the topping is bubbling.
Remove carefully and serve warm.