Spread butter inside the pot on the bottom and side, and cover with a baking sheet of the same shape as the pot.
Make the dough.
Pour the dough into the pot, cover with the lid, and bake for 30 to 40 minutes with extremely low heat.
If no cake sticks to the skewer when it is poked into the middle of the cake, it is done.
Take the cake out of the pot and let it cool.
* Baking time of the cake varies with the temperature and type of dough.