Scrub all the potatoes clean and pat dry. Cut potatoes crosswise into thin slices, but DO NOT cut all the way through. Go slow so you don't chop right through it. Line an 8x8 baking dish with foil and spray with non stick spray. Place potatoes in dish. Gently press down on potatoes to fan slightly.
Combine melted butter and garlic salt. Drizzle over potatoes. Bake, covered, in a 350 oven for 50 minutes. Uncover and bake about 15 more minutes or until tender.
Sprinkle with cheese and return to oven. Broil for just a minute or two. Keep an eye on them so they don't burn. Removed and transfer to plates and sprinkle with chives! YUM!!