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Grate potatoes by hand, or process them in a food processor, and place in a large bowl.
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Add beaten egg yolks to grated potatoes.
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Stir in flour, salt, and baking powder, and mix well.
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Beat egg whites until stiff, and fold into potato mixture.
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On medium high heat, place enough shortening in a large skillet to have about 1/4" deep oil when melted.
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Drop batter by large spoonfuls into hot oil.
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Turn over when edges become a nice crispy brown, about 2 minutes.
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Cook another minute or two on the other side.
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Remove to a paper towel lined plate and sprinkle with salt, if desired.
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Add shortening as needed to keep the oil level deep enough to fry the pancakes, but not deep enough to cover them.