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Combine olive oil, garlic, thyme, and salt in a small container. Set aside.
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Place potatoes in a saucepan and cover with water. Bring to a boil and cook 8-10 minutes, until tender. Drain.
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Toss olive oil and herb mixture with potatoes.
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Place potatoes on aluminum foil and sprinkle with the Parmesan. Fold foil so edges meet.
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Grill over medium high heat for about 20 minutes, rotating halfway through.