The midfielder pounced on Kenny McEvoy's cross 12 seconds into the second half to grab the only goal of the derby in the Barclays Under-21 Premier League.
Nabil's goal handed us a deserved win that stretched our lead to eight points at the top of the Elite Group.
The result also completed the derby double over the Gunners in this second phase of the new competition.
"It’s feels great, I’m proud of how we played," said Nabil, a Second Year Academy trainee formerly of Lille in France, and just 18.
"We were clearly the better side on the night, especially in the first half. In the second half it was a little harder, we got a bit tired but we fought to the end. We deserved the win."
It was Nabil's fourth goal in 11 appearances in an increasingly impressive season. He also started all eight matches in the NextGen Series, scoring once and has appeared nine times for the Under-18s, including the FA Youth Cup.
"I love playing in this team, this is now men’s football for me and it’s been a great experience," he added.
"I feel I’m getting better, I’m working harder and I feel more confident. The coaches give me that confidence, they trust me and that’s why I’m improving."