Preheat and electric griddle to 350 degrees. In a mixing bowl whisk together flour, baking powder, salt and nutmeg. Make a well in mixture then set aside. In a separate mixing bowl, whisk together eggnog, eggs, butter and rum extract until well blended. Pour wet mixture into well in dry mixture and whisk just until combined . Pour about a heaping 1/3 cup onto buttered griddle , spread batter into an even round . Cook until bottom is golden brown then lift, butter griddle once more, flip pancake and cook opposite side until golden brown. Serve warm with butter and maple syrup.