Scrub potatoes and cut them into long ½-inch strips. Place the strips in the ice water, cover, and chill for 1 hour or longer.
Remove potato strips and dry them thoroughly. Preheat oven to 475 °F.
Place garlic powder, onion powder, salt, white pepper, allspice, and pepper flakes in a plastic bag. Toss the potato strips in the spice mixture.
Put the potato strips in a shallow baking pan, and brush them with oil.
Cover the baking pan with aluminum foil, and bake at 475 °F for 15 minutes.
Remove the foil, and continue baking, uncovered, for an additional 15 to 20 minutes or until golden brown. Turn fries occasionally to brown on all sides.