01 - Peel, core, and slice apples into 1/4-inch wedges for even cooking.
02 - Combine melted butter, granulated sugar, and ground cinnamon in a mixing bowl. Add apple wedges and toss thoroughly to coat each slice evenly.
03 - Mix quick oats (or gluten-free breadcrumbs), all-purpose flour, and salt in a separate bowl until well blended.
04 - Dredge the butter-coated apple wedges 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 time. Apples are done when golden brown and crispy.
07 - Serve immediately while warm. Top with whipped cream or vanilla ice cream if desired.