Take a chestnut cutter and place a chestnut right in the middle. Make sure the chestnut is flat and the pointy part of the chestnut is facing you.
The thicker wider part of the chestnut should be facing the cutter part of the chestnut cutter. Once they are all cut, place them on a baking sheet and bake for 30-35 minutes.
Ours take 30 minutes but the time will depend on your oven.
We take them out of the oven, place them in a bowl that is lined with a lint-free kitchen towel, and cover them.
We usually let them rest for 5 minutes and peel them while they are still warm.