Preheat the air fryer to 380°F (193°C).
Wash and dry all vegetables thoroughly.
Cut the vegetables into uniform-sized pieces to ensure even cooking.
Place the bell pepper, zucchini, broccoli, cauliflower, mushrooms, and red onion in a large mixing bowl.
Drizzle with olive oil.
Add garlic powder, sea salt, and black pepper.
Toss everything until the vegetables are evenly coated.
Arrange the vegetables in a single layer in the air fryer basket. Avoid overcrowding for the best texture.
Cook the Air Fryer Vegetables for 8 minutes, shaking the basket halfway through cooking.
Check for tenderness and lightly browned edges. If needed, cook for an additional 1–3 minutes.
Serve immediately while warm.