01 - Peel, core, and slice apples into 1/4-inch thick wedges for even cooking.
02 - Whisk together melted butter, granulated sugar, and ground cinnamon in a large mixing bowl until smooth.
03 - Add apple wedges to the butter mixture and toss thoroughly until every slice is evenly coated.
04 - Combine quick oats, flour, and salt in a separate shallow bowl.
05 - Press each butter-coated apple slice into the dry mixture, ensuring complete coverage on all sides.
06 - Place coated apple slices in a single layer in the air fryer basket, avoiding overlap for proper air circulation.
07 - Cook at 375°F for 10-12 minutes, shaking the basket halfway through cooking time, until apples are golden brown and crispy.
08 - Transfer to serving plates and enjoy warm, topped with whipped cream or vanilla ice cream if desired.