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Boil potatoes; drain well. MASH.
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In a large bowl, combine remaining ingredients; mix well.
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Add potatoes to mixture; MASH again.
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Grease (or spray) a 3-quart casserole dish; spoon potatoes into dish and spread evenly.
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Allow potato mixture to cool to room temperature; cover tightly.
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Store in refrigerator up to a week ahead of time.
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Remove from refrigerator one hour before baking.
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Potatoes may be stiff. Add a bit of milk then fluff up the potatoes.
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Bake 45 minutes uncovered at 350 degrees.