Short Answer:

To make frozen fries extra crispy in an air fryer, lightly spray them with oil before cooking and arrange them in a single layer to avoid overcrowding. Shake or flip the fries halfway through cooking to ensure even crisping.

Cooking at a temperature of 180–200°C (360–400°F) for 15–20 minutes helps achieve a golden, crunchy exterior while keeping the inside soft. These steps enhance texture and flavor, making frozen fries taste closer to freshly fried ones.

Detailed Explanation:

Making Frozen Fries Extra Crispy

Use Light Oil Spray
Spraying frozen fries lightly with a small amount of oil before air frying helps the exterior crisp up. The oil promotes browning and creates a golden crust while keeping the inside tender. Too much oil is unnecessary, as air fryers use circulating hot air to cook food evenly.

Avoid Overcrowding the Basket
For maximum crispiness, spread fries in a single layer in the air fryer basket. Overcrowding prevents hot air from reaching all surfaces, which can result in soggy fries. Leaving space between fries allows air to circulate and evenly cook every piece.

Shake or Flip Midway
Shaking the basket or flipping fries halfway through cooking ensures uniform exposure to hot air. This step prevents uneven cooking and helps all fries achieve the same crispy texture. Without this, some fries may remain soft or undercooked on one side.

Correct Temperature and Time
Cooking at 180–200°C (360–400°F) for 15–20 minutes is ideal for crispy frozen fries. Thinner fries may require slightly less time, while thicker cuts may need a few extra minutes. Maintaining this temperature ensures the exterior crisps without burning the interior.

Optional Seasoning
Adding salt or other seasonings during or after cooking can enhance flavor. For extra crunch, lightly dust fries with cornstarch or flour before spraying with oil. This creates a thin coating that crisps beautifully in the air fryer.

Check and Adjust
Keep an eye on the fries in the final few minutes. If some fries are not crispy enough, cook for an extra 1–3 minutes. Consistently monitoring ensures the fries reach the desired crunch without burning.

Conclusion:

Making frozen fries extra crispy in an air fryer involves using a light oil spray, avoiding overcrowding, shaking or flipping halfway, and cooking at 180–200°C for 15–20 minutes. Optional seasonings and careful monitoring further enhance crunch and flavor. These steps produce fries that are golden, crispy outside, and tender inside, closely resembling traditional fried fries.