01 - Peel, core, and slice the apples into 1/4-inch wedges for even cooking and maximum crispiness.
02 - In a medium bowl, whisk together melted butter, granulated sugar, and ground cinnamon until smooth and fully combined.
03 - Add the apple wedges to the cinnamon butter mixture. Toss gently but thoroughly to ensure every slice is evenly coated.
04 - In a separate bowl, combine quick oats (or breadcrumbs), flour, and salt. Mix well to distribute ingredients evenly.
05 - Working in batches, press each buttered apple slice into the dry mixture, turning to coat completely on all sides for a crispy crust.
06 - Place the coated apple slices in a single layer in the air fryer basket, ensuring pieces do not overlap for proper air circulation.
07 - Cook at 375°F for 10–12 minutes, shaking the basket halfway through cooking time. The apples are done when golden brown and crispy.
08 - Transfer to a serving plate and enjoy warm. Top with whipped cream or vanilla ice cream if desired for extra indulgence.