01 - Peel, core, and slice the apples into 1/4-inch thick wedges. Cut each apple into 8-10 uniform slices for even cooking.
02 - In a large mixing bowl, whisk together melted butter, granulated sugar, and ground cinnamon until fully combined. Add the apple slices and toss gently to coat every piece evenly with the butter mixture.
03 - In a separate shallow bowl, combine quick oats (or gluten-free breadcrumbs), flour, and salt. Mix thoroughly to distribute ingredients evenly.
04 - Transfer the buttered apple slices to the dry coating mixture. Dredge each slice thoroughly, pressing the coating lightly to adhere. Shake off any excess mixture.
05 - Place the coated apple slices in a single layer in the air fryer basket, ensuring pieces do not overlap for proper air circulation and even crisping.
06 - Cook at 375°F for 10-12 minutes. Shake the basket halfway through cooking time to promote even browning. The apples are done when golden brown and crispy around the edges.
07 - Transfer to a serving plate while warm. Top with whipped cream or vanilla ice cream if desired. For best texture, serve within 5 minutes of cooking.