INGREDIENTS
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2 lbs waxy potatoes (like Yukon gold), peeled and sliced very thin, about 1/8 inch thick
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3 sweet Vidalia onions, thinly sliced
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2 cups heavy cream
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1 cup mild or medium cheddar cheese, grated
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1 clove garlic
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1 sprig rosemary
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1 sprig thyme
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2 tablespoons olive oil
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1 tablespoon butter, plus more for greasing dish
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kosher salt and freshly ground pepper, to taste