Preheat air fryer to 400°F. In a large bowl, toss bell peppers, zucchini, and red onion with 1 tablespoon olive oil, garlic powder, oregano, 1/2 teaspoon salt, and black pepper until evenly coated.

Spread vegetables in a single layer in the air fryer basket. Cook for 8 minutes, shaking the basket halfway through, until they start to soften and char at the edges.

While vegetables cook, slice chicken sausage links into 1-inch rounds. Toss with remaining 1 tablespoon olive oil and 1/4 teaspoon salt.

Push vegetables to the sides of the basket and add sausage to the center, or arrange everything in a single layer if space allows. Cook for 6-8 more minutes until sausage is browned and vegetables are tender with caramelized spots.

Transfer to a platter, sprinkle with fresh parsley, and serve immediately.