1. Start with cleaning: Gently wipe the portobello mushrooms using a damp paper towel to remove any dirt. How to clean portobello mushrooms is crucial because you want to avoid soaking them in water, which can make them soggy.

2. Remove the stems by carefully twisting and pulling them off. This makes more room for seasoning and filling if you choose to add any.

3. Season well: Brush both sides of each mushroom cap with olive oil. Then sprinkle salt, pepper, garlic powder, and dried herbs evenly on the caps. The right seasoning for air fryer mushrooms ensures they’re flavorful.

4. Preheat the air fryer to 375°F (190°C). This step is key for ensuring your mushrooms cook evenly.

5. Arrange the mushrooms in the air fryer basket, gill-side up, ensuring they don’t overlap. Overcrowding can lead to uneven cooking.

6. Set the time for 10 minutes. This is the optimal air fryer portobello mushrooms cooking time for mushrooms that are crispy on the outside and tender on the inside.

7. Check for doneness: Larger or thicker mushrooms may need an additional 2-3 minutes. The air fryer temperature settings and cooking times can vary slightly depending on your air fryer model.