To get started, wash and peel your potatoes. You can try different potato varieties, but the standard russet potato works well and you can usually buy large bags for cheap at the grocery store.
Cut the potato in half lengthwise. Then cut each half in half again lengthwise (for really thick potatoes you may need to make two cuts).
Lay the half potato flat on the cutting surface and make 2-4 lengthwise slices to create fries. Each fry should be about 1/4 to 1/2-inch thick. Repeat until all potatoes have been cut into fries.
Place your cut fries into a large mixing bowl. Add 1 Tbsp olive oil, sprinkle on salt and pepper, and mix well. Pour the fries into your air fryer's basket.
Each air fryer has a different capacity and cooking times, so be sure to consult your air fryer's guide to avoid overcooking and overcrowding. You may have to cook in batches. My larger air fryer (6 quarts) can handle about 6 medium potatoes worth of fries, while my smaller air fryer does well with about 4.
The exact cooking time may depend on your air fryer model, but generally speaking 20 minutes at 400 degrees should do the trick. I usually set my air fryer for 23 minutes to accommodate for preheating, but if your air fryer has already been preheated, 20 minutes is perfect.
The secret to crispy homemade fries
Now for the most important part: tossing the fries. Every 5 minutes, pull out the air fryer basket and shake the fries. This keeps them from clumping together and cooking unevenly. Don't skip this step! This is what makes all the difference and gives you crispy fries.
When the fries are fully cooked, transfer from the basket to a plate and sprinkle on some more salt.