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Slice potatoes and add to large bowl of water. Clean potatoes and drain. Pat dry.
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Lay two sheets of aluminum foil and overlap the edges, spray with cooking spray.
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Arrange potatoes in two layers.
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Season and add butter pats on top of potatoes.
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Fold foil over potatoes and seal completely.
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Prepare grill (medium-high heat).
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Place potato packet on grill and cook until heated through and sizzling, turning occasionally, about 25 minutes.
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Transfer packet to serving plate and pierce foil with fork to release steam.
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Open packet carefully.