Short Answer:

To prevent vegetables from drying out in an air fryer, lightly coat them with oil before cooking. This helps retain moisture and encourages even browning.

Cut vegetables into uniform pieces, avoid overcrowding the basket, and cook at the recommended temperature. Shaking or turning halfway ensures even cooking and keeps vegetables tender, juicy, and flavorful while achieving a crispy exterior.

Detailed Explanation:

Preventing Vegetables from Drying Out

Air frying uses circulating hot air to cook food quickly, which can sometimes dry out vegetables if not prepared properly. Applying a light coating of oil before cooking helps lock in moisture and allows the hot air to crisp the exterior without dehydrating the interior. Oil also helps seasonings stick, enhancing flavor and texture.

Proper Cutting and Size
Cut vegetables into uniform pieces to ensure even cooking. Pieces that are too small may cook too quickly and dry out, while very large pieces may take longer to cook, causing the exterior to brown before the interior is tender. Uniform cuts allow all pieces to cook at the same rate, retaining moisture and flavor.

Basket Arrangement
Arrange vegetables in a single layer with space between pieces to allow proper airflow. Overcrowding traps steam and can lead to uneven cooking or dry spots. Using multiple batches for large quantities ensures every piece receives sufficient heat for even cooking without losing moisture.

Temperature and Cooking Time
Cook vegetables at the recommended temperature for each type, usually between 180–200°C (350–400°F). Harder vegetables like carrots or potatoes may require slightly longer, while softer vegetables like zucchini or bell peppers need less time. Monitoring cooking time prevents overcooking, which is a common cause of dryness.

Shaking and Turning
Shaking or flipping vegetables halfway through cooking promotes even exposure to hot air, reduces sticking, and ensures that all surfaces brown evenly. This step helps retain internal moisture while achieving a crisp exterior, preventing parts of the vegetables from drying out or becoming too soft.

Additional Tips
Pat vegetables dry before oiling to remove surface water, which can cause steaming and uneven texture. Lightly seasoning before air frying enhances flavor without drawing out too much moisture. Serve vegetables immediately after cooking to maintain tenderness and juiciness. Certain coatings like breadcrumbs or flour can help lock in moisture while adding texture.

Conclusion

To prevent vegetables from drying out in an air fryer, lightly coat them with oil, cut uniformly, arrange in a single layer, and cook at the recommended temperature. Shaking or turning halfway ensures even cooking and crispiness while preserving internal moisture. Following these steps results in tender, juicy, flavorful, and visually appealing vegetables.