OK, so my memory is off.

"Use the point of a paring knife to slash an X on the flat side of each nut, being sure to cut through the skin.

Bake in a single layer at 425 degrees F. for 10 to 15 minutes for peeling only. If you want them completely roasted, bake 15 to 25 minutes until tender. Stir nuts occasionally during the roasting time.

Always peel chestnuts while they're still warm. If they cool so much that the shell won't easily come off, reheat them briefly."

However, if you use peanut oil on yer nuts, don't put the oven so high. They'll roast jus' fine at 400 degrees.