Using a Mandoline or a sharp Knife, slice the 3 large apples Honeycrisp, Fuji, or Gala — cored and sliced paper-thin (about 1/16 inch) crosswise into very thin rounds, about 1/16 inch thick. Remove any seeds. Pat the slices dry with Paper Towel to remove excess moisture — this is key for crispiness.

In a small Mixing Bowl, combine the 1 tbsp granulated sugar, 1 tsp ground cinnamon, and ¼ tsp fine sea salt. Toss the 3 large apples Honeycrisp, Fuji, or Gala — cored and sliced paper-thin (about 1/16 inch) slices with the 1 tbsp lemon juice freshly squeezed and melted 1 tsp coconut oil melted, or neutral cooking spray (and ¼ tsp vanilla extract if using), then sprinkle the cinnamon-sugar mixture evenly over both sides of each slice.

Preheat your Air Fryer to 300°F. Arrange the 3 large apples Honeycrisp, Fuji, or Gala — cored and sliced paper-thin (about 1/16 inch) slices in a single layer in the Air Fryer basket — do not overlap. Work in batches as needed. Air fry for 8–10 minutes, flip each slice carefully, then continue cooking for another 8–10 minutes until the edges are curled and the chips look dry and lightly golden.

Remove the chips from the Air Fryer and let them cool on a wire rack or flat surface for 5–10 minutes — they will continue to crisp up as they cool. Drizzle with ½ tsp maple syrup drizzled over slices for extra sweetness if desired. Serve immediately or store in an Airtight Container at room temperature for up to 2 days.