Short Answer:

To prevent frozen vegetables from becoming soggy in an air fryer, avoid overcrowding the basket and cook at the recommended temperature of 180–200°C (360–400°F). Proper airflow ensures even roasting and a slightly crispy exterior.

Shaking or tossing the vegetables halfway through cooking helps all sides receive heat evenly. Using a light spray of oil and not overcooking preserves texture, keeping the vegetables tender yet firm instead of soft and watery.

Detailed Explanation:

Preventing Soggy Frozen Vegetables

Proper Basket Arrangement
Arrange frozen vegetables in a single layer in the air fryer basket. Overcrowding blocks hot air circulation, which can lead to uneven cooking and soggy spots. Spacing the vegetables allows hot air to reach all surfaces, ensuring a crispy exterior and tender interior.

Correct Temperature
Cooking frozen vegetables at 180–200°C (360–400°F) allows the surface to roast quickly while the interior heats properly. Lower temperatures may cause steaming rather than roasting, leaving vegetables soft and soggy. Higher temperatures can burn the edges before the vegetables cook evenly.

Shaking or Tossing Midway
Shaking or tossing the vegetables halfway through cooking exposes all sides to hot air, preventing soft spots. This step promotes even browning, reduces moisture accumulation on the surface, and ensures uniform texture throughout the batch.

Optional Light Oil Spray
Lightly spraying vegetables with oil before cooking helps moisture evaporate faster and enhances crispiness. Oil forms a thin layer that allows the hot air to roast the surface without making the vegetables greasy. Too much oil can create a soft coating, so use only a small amount.

Avoid Overcooking
Cooking vegetables longer than needed can release excess water and make them soggy. Monitor vegetables near the end of cooking and remove them once the edges are golden and slightly crisp while the interior remains tender.

Preheating the Air Fryer
Preheating for 2–3 minutes before adding frozen vegetables ensures that they cook evenly from the start. Immediate exposure to hot air prevents excessive steaming and helps the outer layer crisp quickly, preserving texture.

Choosing Suitable Vegetables
Firm vegetables like broccoli, cauliflower, carrots, and bell peppers handle air frying from frozen better than watery vegetables like zucchini or spinach. Choosing low-moisture vegetables helps achieve a roasted, non-soggy texture.

Conclusion:

Preventing frozen vegetables from becoming soggy in an air fryer requires proper basket arrangement, cooking at 180–200°C, shaking or tossing midway, optional light oil, avoiding overcooking, and preheating. These steps ensure even heat circulation, crisp edges, and tender interiors, producing roasted vegetables with excellent texture and flavor directly from frozen.