Preheat the air fryer to 390°F (200°C) for 3–5 minutes. A hot basket gives you better browning.
Prep the veggies. Wash, dry well, and cut into even pieces.
Aim for bite-size chunks so everything cooks at the same rate.
Toss with oil and seasonings. In a large bowl, add vegetables, oil, salt, pepper, garlic powder, and paprika. Mix until evenly coated. If using soy sauce or Italian seasoning, add now.
Load the basket in a single layer. Avoid crowding.
A little overlap is fine, but air needs to circulate for crisp edges. Work in batches if needed.
Air fry for 10–15 minutes. Shake the basket halfway through. Softer veggies (zucchini, peppers, onions, green beans) cook in about 10–12 minutes.
Denser veggies (carrots, Brussels sprouts, cauliflower) take 12–15 minutes.
Check for doneness. Look for golden edges and a tender bite. If you want more color, add 2–3 more minutes.
Finish and serve. Move veggies to a bowl, then add a squeeze of lemon, a pinch of salt, and any toppings like Parmesan or fresh herbs. Serve hot.