Dry the butter beans after rinsing.
Mix cornstarch, salt, paprika, garlic powder, onion powder, and black pepper in a bowl. Coat the beans in this spice mix.
Drizzle the beans with olive oil for even cooking.
Preheat the air fryer to 380°F (193°C).
Place beans in a single layer in the air fryer basket.
Cook for 15-20 minutes, shaking the basket halfway through, until crispy and golden.
