Van Aanholt found Schlupp with a clever pass before the former Leicester man fired a finish into the roof of the net.
"Patrick and I have a great understanding down that left-hand side," he told Palace's official website.
"The moment he got the ball there was a bit of eye contact for me to show him where I wanted the pass and he played it perfectly and I just had to concentrate on hitting the target, it went in so I am happy.
"You could see how much it meant to me with the celebration and what a time to do it, I have waited a long time and enjoyed that one."