Preheat Air Fryer: Preheat your air fryer to 375°F (190°C).

Prepare Apple Filling: In a bowl, combine the thinly sliced apples, granulated sugar, brown sugar, ground cinnamon, ground nutmeg, lemon juice, and cornstarch. Mix well to coat the apples evenly. Let the mixture sit for about 15-20 minutes to allow the flavors to meld.

Roll Out Puff Pastry: Roll out the thawed puff pastry sheets on a lightly floured surface. Cut the pastry sheets into squares or rectangles, depending on your preference and the size of your air fryer basket.

Assemble the Apple Pie: Place a spoonful of the apple filling onto one half of each pastry square. Add a small piece of butter on top of the filling. Fold the other half of the pastry over the filling to create a triangle or rectangle shape. Press the edges with a fork to seal the pie.

Brush with Egg Wash: Brush the top of each pie with the beaten egg. This will give the pastry a golden-brown color when baked.

Air Fry the Pies: Place the assembled pies in a single layer in the air fryer basket. Depending on the size of your air fryer, you may need to cook them in batches.

Air Fry and Flip: Air fry the pies at 375°F (190°C) for about 12-15 minutes, flipping them halfway through the cooking time. The pies should be golden brown and crispy.

Serve: Once the pies are cooked and golden, remove them from the air fryer and let them cool slightly. Dust with powdered sugar if desired. Serve warm with a scoop of vanilla ice cream for an extra indulgent treat.

Enjoy: Indulge in the delightful flavors of your homemade Air Fryer Apple Pie with Puff Pastry!