Preheat the air fryer: Set it to 390°F (200°C) for 3–5 minutes. A hot basket helps the fries crisp faster.
Cut the veggies evenly: Aim for similar thickness so everything cooks at the same rate.
Keep sticks around 1/4-inch for roots and 1/2-inch for softer veggies like zucchini and peppers.
Dry the veggies: Pat with paper towels, especially zucchini and peppers. Dry surfaces = better browning.
Season: In a large bowl, toss veggies with oil, 1 teaspoon salt, pepper, garlic powder, paprika, and onion powder. If using cornstarch, sprinkle it over and toss again to lightly coat.
Air fry in batches: Add a single layer of veggies to the basket. Don’t overcrowd. Cook 10–14 minutes, shaking the basket halfway. Root veggies may need the full time; zucchini and peppers often finish sooner.
Taste and adjust: When fries are browned and tender, transfer to a plate.
Sprinkle with the remaining 1/2 teaspoon salt while hot. Repeat with remaining veggies.
Garnish and serve: Add fresh herbs and a squeeze of lemon if you like. Serve immediately with your favorite dips.