Prep the carrots: If using whole carrots, peel and cut into even 1/2-inch sticks or coins. Aim for uniform size so they cook evenly.
Preheat the air fryer: Set to 380°F (193°C) for 3–5 minutes. A hot basket helps the carrots caramelize.
Season: In a bowl, toss carrots with olive oil, salt, pepper, cinnamon, and garlic powder.
Coat evenly.
First cook: Add the carrots to the air fryer basket in a single layer (a bit of overlap is okay). Cook for 8–10 minutes, shaking the basket halfway through.
Make the glaze: While carrots cook, whisk maple syrup, melted butter, and apple cider vinegar (or lemon juice) in a small bowl.
Glaze and finish: After the initial cook, pour the maple glaze over the carrots and toss to coat. Air fry another 4–6 minutes, shaking once, until the glaze is glossy and the edges are lightly caramelized.
Taste and adjust: Season with a pinch more salt if needed.
Garnish with chopped herbs or flaky salt. Serve warm.