Wash the green beans thoroughly and trim off the ends. If the beans are particularly long, you can also cut them in half for easier handling and even cooking. Ensure that the green beans are completely dry before proceeding to the next step, as excess moisture can hinder the crispy texture.
In a bowl, toss the green beans in the oil so they all get coated.
Then, generously sprinkle some salt and pepper over them, again making sure all green beans get seasoned.
Spread them out in a single layer to ensure even cooking. It’s essential not to overcrowd the basket, as this can lead to uneven cooking and soggy results. If necessary, cook the green beans in batches.
Air fry at 400°F (200°C) for 8 minutes, shaking the basket in the middle of the cook time to rotate the green beans so they cook evenly.
Once the green beans are cooked to perfection, remove them from the air fryer. Allow them to cool for a few minutes before serving to ensure maximum crispiness.
Squeeze a little lemon juice over the top before serving.