Place potatoes on cast iron griddle or directly on oven rack (place a dish below potatoes if using oven rack method in order to reduce mess in your oven). Bake for 60 -80 minutes. (Adjust time according to temperature…if you are in a hurry and you increase your temperature, reduce your time. )
Once potato can be pierced easily with a fork, remove from oven.
(Optional: Prepare in microwave)