Preheat air fryer to 350℉ or a grill pan over medium heat.
To a small bowl, mix together melted butter, maple syrup, and cinnamon. Set aside.
Spray or brush nonstick cooking spray or olive oil to each peach and place in air fryer basket or grill pan, cut-side down.
Air-fry for 5 minutes at 350℉, or grill 3-ish minutes.
Flip and generously brush maple syrup mixture to peaches until well seasoned.
Air fry for 5 more minutes, or grill for 2-3 more minutes. Top with ice cream and crushed pistachios. Dig in and enjoy!