Cut potatoes length-wise into thin strips. Soak in a bowl of cold water for approximately two hours (or at minimum, one).
Preheat oven to 425 degrees F. Blot fries with a paper towel to remove as much moisture as possible. In a large bowl, toss fries with cornstarch, salt, pepper, garlic powder, and Old Bay seasoning. Add olive oil and toss again to coat fries evenly.
Spray an oven-safe wire rack with cooking spray. Arrange fries in rows on wire rack set over a cookie sheet, taking care to reserve a little space between each fry. Spray fries liberally with olive oil spray.
Bake for fifteen minutes, then remove from oven and spray fries again with cooking spray. Place fries back in oven and cook for an additional fifteen minutes, or until fries reach your desired doneness. Serve immediately, and if desired, drizzle white vinegar over top of fries.
Nutritional information is provided as an estimate. As it can vary due to many factors (brands used, quantities, etc.), we cannot guarantee its accuracy.