Rinse the chestnuts well under cold water. They can be dusty or a bit grimy, especially if they’re fresh from the market.
Chestnuts have tough shells, and if you don’t cut them, they’ll explode while cooking. Take your paring knife and carefully cut an “X” into the rounded side of each chestnut. Go through the outer shell and just into the inner skin. Be careful here. The shells can be slippery. Holding the chestnut on a cutting board rather than in your hand makes it safer.
Once scored, toss them into a pot of water, bring to a gentle boil, and let them blanch for 10 minutes. You can add a teaspoon of salt to the water at this stage for extra flavor.
Preheat your air fryer to 375°F (190°C). Not all air fryers need preheating, but it helps get that even roast.
Drain the chestnuts from the water and pat them dry. You don’t want them dripping wet.
Place the chestnuts in the air fryer basket, cut side up. Don’t overcrowd the basket. Give them space so the air can circulate.
Roast for 12–15 minutes, shaking the basket once halfway through. You’ll know they’re done when the shells curl back and the nut inside looks golden.
Once out of the fryer, wrap them in a clean towel for 10 minutes. This step traps the heat and steam, loosening the skins. After that, they’re ready to peel and eat. Grab a warm one and peel off the shell while it’s still soft.