In a medium bowl, mix together flour, salt, and baking powder. Stir in mashed potatoes and onion until thoroughly combined. In a separate bowl, whisk together eggs and milk, and stir lightly into potato mixture.

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Stir in corn syrup and nutmeg, mixing well. Heat a large griddle to medium-high heat. Coat with shortening and spoon potato mixture onto griddle in 12 equal portions. Fry until brown on both sides. Serve hot.