01 - Peel, core, and slice the apples into 1/4-inch thick wedges.
02 - In a large bowl, whisk together melted butter, granulated sugar, and ground cinnamon until combined. Add apple slices and toss gently to coat evenly.
03 - In a separate bowl, combine oats or breadcrumbs, flour, and salt. Mix thoroughly to distribute ingredients evenly.
04 - Dredge each buttered apple wedge in the flour-oat 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 even crisping.
06 - Cook at 375°F for 10-12 minutes, shaking the basket halfway through cooking time. Apples are done when golden brown and crispy.
07 - Transfer to serving plates and serve immediately while warm. Top with whipped cream or vanilla ice cream if desired.