Thinly slice the potatoes either with a knife or a mandoline/food processor with a thin setting for slicing works well too. Place the potato slices into a bowl of cold water to rinse some of the starch off.
Lightly spray the air fryer basket with the cooking oil spray.
Remove the potato slices from the water and drain well before laying them on paper towel to dry.
Place the potato slices in an even layer. Lightly brush the potatoes with the vegetable oil and cook them in the air fryer for about 20 minutes.
Using a pair of tongs gently remove the chips from the air fryer. Season them with the sea salt and black pepper. Repeat if more chips are desired.