Heat 1/3 inch oil in a 12-inch nonstick skillet over moderately high heat until hot but not smoking. Fill a 1/4-cup measure (not tightly packed) with latke mixture and carefully spoon it into skillet, then flatten to 3 inches in diameter with a slotted spatula. Form 3 more latkes in skillet, then fry until undersides are deep golden, 1 1/2 to 3 minutes. Turn over using 2 spatulas and fry until deep golden all over, 1 1/2 to 3 minutes more. (If latkes brown too quickly, lower heat to moderate.)