Cole Palmer scored four first-half goals against Brighton in an impressive performance at Stamford Bridge.
The blues They trailed 1-0 after seven minutes thanks to calamitous defending that allowed Georginio Rutter to head in the first goal.
However, Chelsea improved drastically and took advantage of the Seagulls' high line to score three goals in a row.
palmer He scored them all in an excellent period of the first half, the first being a touch after a pass from Nicolas Jackson.
He then scored from a penalty after a foul by Jadon Sancho inside the area, but the best effort came on his third shot.
Following a foul on Noni Madueke, Palmer curled a free kick into the top right corner of the goal with an impressive effort.
He sealed his third hat-trick for Chelsea, with the other two coming against Manchester United and Everton last season.
His tally has equaled that of Chelsea legends Jimmy Floyd Hasselbaink, Didier Drogba and Frank Lampard in the Premier League.
However, Brighton fought back moments after Palmer's free-kick as Carlos Baleba took advantage of poorer defending.
However, Palmer added his and Chelsea's fourth goal four minutes before the break, the second time he has scored a quartet of goals in blue after the 4-3 win over United.
It is the first time in Premier League history that a player has scored four goals before half-time.
His 43 total goal contributions are also the most in the Premier League since his debut for the Blues last September, three more than Erling Haaland.
Palmer's total output for Chelsea now stands at a whopping 31 goals in 53 appearances in all competitions, 28 of which have come in the Premier League.
The former Manchester City player also has 19 assists to his name for the Blues, making 50 contributions in total.