The Norwegian striker struck in the 9th minute, latching onto a precise through ball before finishing clinically past Caoimhin Kelleher.
It was his ninth consecutive match with a goal for club and country, underlining a run of form that has made him the most dangerous forward in Europe this season."You can say so, I've never felt better than I do now," Haaland said when asked if this was the peak of his career.
"It's about preparation, being physically and mentally ready. Having a kid has also helped me. I disconnect more from football now, and when I go home, I relax even more. I need to give a shoutout to my son!"
The 25-year-old admitted Brentford reminded him of a different challenge. "It was a tough game and it reminded me a bit of Stoke City with Rory Delap 15 years ago," he said.
"They're huge and do throw-ins from the middle. It's not easy, but it's about preparing properly, and we did. Credit to the backroom staff for their work."
City were forced to break down a deep Brentford defence, with Haaland praising the resilience needed to find space.
"Even when people are low, there's always a gap if you time it right. A low block is not easy with three centre backs and two midfielders in front of them. That's why it feels even better to score in these games."
Pep Guardiola praised his striker's mentality and impact after the match. "Erling is unbelievable," the City manager said. "It was not an easy game, Brentford are very strong in the air and defend with everything, but he always finds the moment. Nine games in a row scoring shows his consistency.
"He helps us in every way, not just with goals but with his presence."
Haaland's decisive strike not only secured the points but also extended his remarkable scoring streak, keeping City firmly in the title race as they prepare for a demanding run of fixtures.