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Cut potatoes into good-sized chunks. Don't peel yellow or red potatoes, but do peel russets.
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Cook potatoes in salted water until done.
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Drain and mash potatoes. It's okay to leave them a little chunky.
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Add sour cream, cream cheese, and garlic.
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Mash some more. If the mixture is too dry, add half & half until the consistency you like.
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Fold in grated cheese and green onions.
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Dump potato mixture into a well-buttered crock pot. If you're saving for another day, keep crock pot liner in refrigerator.
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Take crock pot liner out of refrigerator about an hour before you plan to turn the crock pot on.
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When ready to heat up again, place a kitchen towel (not a color that will leach into the potatoes) on top of the potatoes to absorb the condensation that will drip off the inside of the lid while heating in the crock pot.
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Place the lid on top and turn on crock pot.
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Cook on low for a few hours, stirring well every 30 minutes or so the potatoes don't brown against the sides and bottom of the crock pot.