01 - Peel, core, and slice the apples into 1/4-inch wedges for even cooking.
02 - In a large bowl, combine melted butter, granulated sugar, and ground cinnamon. Add apple slices and toss thoroughly to coat each piece evenly.
03 - In a separate bowl, mix quick oats (or breadcrumbs), flour, and salt until well combined.
04 - Dredge the buttered apple slices in the dry mixture, pressing gently to adhere the coating to all sides.
05 - Place coated apple slices in a single layer in the air fryer basket, ensuring pieces do not overlap for proper crisping.
06 - Cook at 375°F for 10 to 12 minutes, shaking the basket halfway through cooking, until apples are golden brown and crispy.
07 - Transfer to serving plates and enjoy immediately, topped with whipped cream or vanilla ice cream if desired.