For this here potato:
Slice it like so, but don't cut all the way through. Leave a wee bit at the bottom to hold it together.
Drizzle some olive oil.
Sprinkle some salt, pepper,and garlic powder. Put a sliver of butter on top if you're feeling like splurging. Cook at 400 degrees for about 45 minutes (check it every now and then) and voila...
...a fun crispy yet soft pull-apart potato, best eaten with the fingers.