Shred potato and apple through the large holes of a box grater. Serve latkes with sour cream or applesauce.
Spread potato and apple onto dry kitchen towels; roll up and wring towels to remove liquid. Combine potato mixture, egg and next 8 ingredients.
Pour oil to a depth of 1/4 inch in a large skillet. Heat oil over medium-high heat; drop potato mixture, by tablespoonfuls, in batches; slightly flatten each latke. Cook 2 minutes on each side or until browned. Drain latkes on paper towels. Keep warm on a wire rack in a jelly-roll pan in a 200° oven. Sprinkle with chives, and add salt to taste.