Preheat the oven to 425°F
Rinse and dry the chestnuts
Cut an X into the flat side of each chestnut
Place the chestnuts on a baking sheet with the cut side up
Roast for 20 to 25 minutes
Remove from the oven when the shells open and the nuts are tender
Wrap the hot chestnuts in a clean towel for 5 to 10 minutes
Peel off the shells and inner skins while still warm