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Boil potatoes in chicken broth, adding water to cover potatoes, if necessary. Once cooked, reserve the liquid.
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Cream the cooked potatoes, roasted garlic and cream cheese. If necessary, use small portions at a time of the reserved liquid to obtain the desired creaminess for the potatoes. (I don't usually need to add much, if at all.).
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Add salt and pepper, to taste.
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Transfer to a greased, 9 x 13 baking dish.
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Cool and refrigerate over night.
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Let the potatoes come to room temperature for 30 minutes.
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Preheat oven to 350.
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Top with parmesan.
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Bake for 30 minutes at 350.