Preheat the air fryer: Set your air fryer to 380°F (193°C) for 3–5 minutes.
A hot basket helps the carrots crisp.
Prep the carrots: If using whole carrots, peel and cut into evenly sized sticks or coins, about 1/2 inch thick. Pat dry to remove excess moisture.
Season: In a bowl, toss carrots with oil until coated. Sprinkle in ranch seasoning, garlic powder, smoked paprika, a pinch of salt, and a few grinds of pepper.
Toss again until every piece is well seasoned.
Air fry in a single layer: Add carrots to the preheated basket in a mostly single layer. A little overlap is fine, but avoid crowding.
Cook: Air fry for 10–14 minutes, shaking the basket halfway through. Start checking at the 10-minute mark.
You want tender centers with lightly caramelized edges.
Finish: Transfer carrots to a bowl. Squeeze over lemon juice, if using, and toss. Taste and adjust salt and pepper.
Garnish with herbs and a sprinkle of Parmesan, if you like.
Serve hot: Pair with grilled chicken, salmon, burgers, or add to grain bowls and salads.