Peel the sweet potatoes and cut them into even 1/2-inch cubes. Consistent size is important so everything cooks at the same rate. Dice the red onion and red bell pepper to a similar size.
In a large bowl, combine the sweet potato cubes, diced red onion, and diced red bell pepper. Drizzle with olive oil and sprinkle on the smoked paprika, garlic powder, cumin, salt, black pepper, and cayenne pepper. Toss everything together until well coated.
Preheat the air fryer to 380 degrees F. Transfer the seasoned vegetables to the air fryer basket, spreading them out in as even a layer as possible.
Air fry at 380 degrees F for 15 to 18 minutes, shaking the basket every 5 minutes to ensure even cooking. The hash is ready when the sweet potatoes are tender inside with crispy golden edges and the onion and pepper are lightly caramelized.
Transfer the hash to a serving dish and sprinkle with fresh chopped chives. Serve as a side dish or as a base for fried eggs for a complete breakfast.