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Set oven to 375 degrees.
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Grease 16 muffin cups.
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Peel potatoes, and grate in a food processor; drain well (squeeze out any excess moisture with hands) and place in a large bowl.
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Grate the onions, and add to the potatoes, along with the eggs; mix very well with a wooden spoon.
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Don't allow too much time to pass during this process, or the potatoes will darken in colour-- (work fast!).
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In a small bowl, combine the flour, baking powder, salt and pepper; blend/mix into the potato mixture.
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Add in the melted butter; stir well.
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Spoon and evenly divide the mixture between the muffin cups (should have enough batter for about 16 muffin cups), filling to the top.
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Bake for 50-60 minutes, or until brown and crusty.
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Cool for a couple of minutes, then remove by running a knife around each one.
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TO FREEZE: set the potato cups on a sheet, and freeze completely.
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Remove from the freezer, and store in zip-loc plastic freezer bags.
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To serve reheat in the oven.