Massage your potatoes in olive oil, and place them on a lined cookie sheet. Give your potatoes lots of room, you do not want to cram your potatoes.
Bake for 45 minutes, or until tender.
Pull them out of the oven, and let them rest for 5-10 minutes.
This is the tricky part: smashing the potato. You want to gently cut a slit from top to bottom (do not pierce through to the bottom). Then turn the potato and make 3 small slits. That's 1 cut down and 3 cuts across.
Now, take your fork and starting from the inside out, and smash the potato until you get a potato looking like a UFO.
Add a tsp. of butter to the middle of each potato and sprinkle with desired seasonings.
Place potatoes back in the oven on BROIL and cook for an additional 3-5 minutes, or until tops are golden brown.