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Cut peeled potatoes in half and boil until firm but tender (alternately, you can microwave the potatoes); allow to cool.
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Coarsely grate potatoes into a greased casserole dish.
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Add green onion and half the cheese on top.
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Combine cream, milk, garlic powder and pepper.
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Pour over potato and cheese, then top with remaining cheese (and 1/2 teaspoons nutmeg if you want).
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Chill for 2 hours or overnight.
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Bake uncovered in the oven at 350F for 40 minutes.
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Cooking time includes time for potatoes to boil prior to prepping dish.
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Even great the next day (I warmed it in the microwave for lunch).