Nwaneri became the youngest player in Premier League history when he came on in the closing moments of Arsenal's 3-0 win at Brentford in September 2022 aged just 15 years and 181 days.
"School in the morning, he's got school in the morning," sang Arsenal's travelling fans at the time.
On Saturday, tens of thousands of fans inside Emirates Stadium sang "he's one of our own, Ethan Nwaneri, he's one of our own" after he scored.
Fans have been calling for the teenager to get more minutes after promising performances in the EFL Cup, and his well-taken goal against Forest will only add to the clamour.
He has scored four goals in 238 minutes this season, with 170 of those minutes in the EFL Cup, 60 in the Premier League and eight in the Champions League.
Across the big five European leagues, Nwaneri is one of only two players aged under 18 to have scored more than once across all competitions this term after 17-year-old Barcelona and Spain talent Lamine Yamal.
Arteta explained why he was managing Nwaneri's minutes "step by step" after the win over Forest.
"He's giving us all the reasons to play, another reason to put him there," said the Arsenal boss.
"I am responsible to build a career for him. You have to do that brick by brick. Today he put another brick.
"Now we have to put cement, make sure it doesn't get dry so we can put another one and that will stick. Then we put one more layer, one more layer.
"If you want to put five in a row believe me - it won't work. We have to manage not only his expectation but his workload as well, which is really important.
"You can sense how much the crowd loves watching this kid play and the energy."