01 - Peel, core, and slice the apples into 1/4-inch wedges for even cooking.
02 - In a large bowl, whisk together melted butter, granulated sugar, and ground cinnamon until well combined. Add apple slices and toss gently to coat evenly.
03 - In a separate bowl, combine quick oats (or gluten-free breadcrumbs), flour, and salt. Mix thoroughly to incorporate.
04 - Dredge the buttered apple slices in the dry mixture, pressing lightly to adhere the coating to each wedge.
05 - Place coated apple slices in a single layer in the air fryer basket, ensuring pieces do not overlap for optimal crispiness.
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 - Transfer to serving plates and enjoy immediately, topped with whipped cream or vanilla ice cream if desired.