It took the hosts seven minutes to break the deadlock as Van der Vaart marked his 101st cap with a cool finish.
Their lead was doubled eight minutes later when Huntelaar got on the end of Jeremain Lens's cross to convert.
Van Gaal's men put the result beyond doubt just minutes into the second half when debutant Schaken pounced in the area.
The hosts continued to attack in search of more goals and nearly got a fourth but for Van der Vaart's wayward strike.
Huntelaar was then denied twice by Andorra goalkeeper Josep Gomes, who kept the score from being an embarrassment for the visitors.
The shotstopper did well to push away the striker's initial header before pulling off an instinctive save a minute later.