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Preheat oven to 400F. Scrub potatoes.
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Slice the potatoes very thinly, without going all the way through.
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Alternate the butter and the parmesan, stuffing them in between the slices of the potato. Season the potato with garlic powder and kosher salt. Drizzle the potato with olive oil.
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Bake for about 45 minutes or until tender. Remove from the oven and drizzle heavy cream over the potatoes. Top with cheddar cheese.
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Place back in the oven for 10-12 more minutes. Remove and serve hot with sour cream and chives, if desired.