Start by trimming the ends of your green beans and giving them a thorough rinse. Pat them dry completely with a clean towel or paper towels—removing excess moisture helps them become crispy.
Preheat your air fryer to 200°C (400°F). This usually takes about 3 minutes and ensures even crisping from the start.
In a mixing bowl, toss the dried green beans with olive oil, salt, garlic powder, and paprika. Use tongs or your hands to coat each bean evenly—you should see a slight sheen and a little seasoning clinging to the surface.
Spread the seasoned green beans in a single layer in the air fryer basket. Avoid overcrowding so hot air can circulate freely, which is key for crisping.
Roast the green beans for 8 to 10 minutes. Shake the basket halfway through to promote even cooking and crispness. You’ll start to smell a nutty, smoky aroma, and edges will begin to brown slightly.
Check for doneness: the beans should be tender inside with crispy tips and a golden-brown hue. If they need a little more crisping, toss them back in for another 1-2 minutes.
Once done, transfer the green beans to a serving dish. Squeeze fresh lemon over them for brightness, if desired, and give a gentle toss to combine.
Serve immediately while they're hot and crispy. Enjoy the smoky, tender bites that feel both satisfying and fresh.