Slice the potatoes into french fry shape, about 1/4-inch thick (see note). If you have a mandolin, you may wish to use that. Thicker cuts (1/2-inch) are fine if you like that better. Cook time will increase (13-15 minutes). Submerge cut potatoes in a bowl of cold water and let soak for 20 minutes (or up to overnight in the fridge).
1 medium Yukon gold or russet (Idaho) potato, scrubbed
When the fries are almost done soaking, preheat air fryer to 380ºF (4-5 minutes).
Drain potatoes and pat dry with a paper towel or a lint-free tea/dish towel. Dry bowl and place fries back in bowl. Drizzle with olive oil and sprinkle with salt and pepper. Toss to coat.
1 to 2 teaspoons olive oil, ¼ teaspoon kosher salt, ⅛ teaspoon black pepper, more or less to taste
Place a single layer of fries in the basket of the air fryer (you can also get away with a double layer) and cook for 10-13 minutes, shaking basket occasionally, or until fries are crispy and golden brown. You can pile them up a little bit but remember that the more air flow, the crispier your fries will be.
Keep an eye on them towards the end. They brown quickly.
Serve immediately or keep warm in oven (see notes).
Video
Notes
Yukon gold potatoes have a creamier texture; russet or Idaho potatoes are more like restaurant fries, fluffier and more mealy.
Cook Time:
Skinny fries (1/4-inch) like the ones pictured take about 10-13 minutes
Thicker fries (think steak fries - 1/2-inch or so) will take closer to 20 minutes.
Frozen store-bought French fries take about 25 minutes, depending on the variety.
Double or triple the recipe but cook them in batches.
To keep fries warm: Put cooked fries on a wire baking rack placed on top of a sheet pan in a warm oven (175-200ºF). This will keep the cooked fries warm and crispy while you finish cooking the rest of the fries.
Leftover fries will keep in a covered container (cool completely before sealing) in the refrigerator for up to 3 days or in the freezer for up to 3 months. Reheat briefly in the air fryer for best results. Frozen fries do not need to be thawed before reheating.
Soaking the potatoes: Soaking the potatoes after they're cut draws out some of the starch which is naturally present in potatoes. This will result in a crispier fry. You can skip it if you're in a hurry, but it will have a small effect on the final product.