Core the apples and slice them into approximately ¼-inch thick segments.
Place the apple slices into a mixing bowl and sprinkle with sugar, cinnamon, and sea salt.
Toss the slices gently to coat them evenly with the cinnamon-sugar mixture, feeling the texture become sticky and fragrant.
Arrange the coated apple slices in a single layer inside the air fryer basket.
Set the air fryer to 375°F (190°C) and cook for about 10 minutes until the skins turn crispy and golden, and edges start to caramelize.
Once done, carefully remove the basket and listen for the satisfying crunch as the apples are crisped to perfection.
Serve immediately while warm; enjoy the crispy skins and tender, juicy insides that burst with cinnamon-scented flavor.