Preheat your air fryer to 400°F (200°C). This usually takes around 3-5 minutes, depending on the model of your air fryer.
In a large bowl, toss the frozen crinkle cut fries with the oil, ensuring they are evenly coated.
If you prefer seasoned fries, mix the salt, black pepper and garlic powder in a small bowl. Sprinkle the seasoning mixture over the fries and toss until evenly distributed.
Place the seasoned fries in a single layer in the air fryer basket, ensuring they are not overcrowded. You may need to cook them in batches, depending on the size of your air fryer.
Cook the fries for 10-12 minutes, shaking the basket halfway through the cooking time to ensure even cooking.
Once the fries are golden brown and crispy, carefully remove them from the air fryer and transfer them to a serving plate. Enjoy your delicious air fryer crinkle cut fries!