01 - Peel, core, and slice the apples into 1/4-inch wedges.
02 - Whisk together melted butter, granulated sugar, and ground cinnamon in a mixing bowl until well combined. Add apple slices and toss thoroughly to ensure even coating.
03 - Combine oats or breadcrumbs, flour, and salt in a separate bowl. Mix until evenly distributed.
04 - Dredge each butter-coated apple slice 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 optimal crisping.
06 - Cook at 375°F for 10 to 12 minutes, shaking the basket halfway through cooking time. The apples are done when golden brown and crispy.
07 - Transfer to a serving dish and enjoy warm, optionally topped with whipped cream or vanilla ice cream.