We think air-fried curly fries are really delicious! But if you want that fast food flavor, your fries will need to be fried in oil. If you don't want to completely fry your curly fries, you can try this method: Fully cook your fries in the air fryer. While they're cooking, slowly heat up a few inches of oil in a cast iron or large, deep skillet. You'll want your oil to be about 375 degrees. Once your curly fries are finished cooking, drop them in small batches in the hot oil for about 30-45 seconds. You don't want them to overcook; you just want the outside to get a bit crispy from the hot oil.