Preheat the air fryer: Set to 390°F (200°C) for 3–5 minutes. A hot basket helps the vegetables crisp faster.
Prep the vegetables: Rinse and dry the potatoes well.
Peel the carrots and cut them into evenly sized pieces so they cook at the same rate as the potatoes.
Season: In a large bowl, combine potatoes and carrots with oil, salt, pepper, garlic powder, smoked paprika, and thyme. Toss until every piece is well coated.
Load the basket: Add the vegetables in a single layer if possible. A little overlap is fine, but don’t tightly pack the basket.
Work in batches if needed.
Air fry, shake, and check: Cook for 16–20 minutes total, shaking the basket or tossing with tongs halfway. Start checking at 14 minutes. You’re looking for browned edges and fork-tender centers.
Finish with flair: Taste and adjust salt.
Toss with chopped parsley or chives. For extra pop, add lemon zest or a light shower of Parmesan while hot.
Serve: Plate immediately for the best crispness. These are great with grilled chicken, baked salmon, burgers, or a dollop of herby yogurt sauce.