Ellis Simms scored his first goal for Everton to grab Sean Dyche's side a crucial point in their battle for survival at Stamford Bridge on Saturday evening.
Having trailed twice to Chelsea, the Toffees pegged the hosts back, first through Abdoulaye Doucoure and then, in dramatic fashion, Simms at the death.
Joao Felix had given the Blues the lead before Kai Havertz had restored it from the penalty spot after Reece James was brought down by James Tarkowski.
Halting the Blues' recent mini resurgence in its tracks, Everton built upon last week's win over Brentford to stay out of the drop zone.
Here, Adrian Kajumba provides the ratings for each player while Julian Bovill offers the verdict.
Kepa Arrizabalaga - 5.5.
Spaniard should have done better to keep out Simms' effort at the end. Having enjoyed a renaissance in his Chelsea career earlier this year, he has made a series of errors in recent weeks that has seen questions over his status as the club's No 1 re-emerge.
Reece James - 6.5.
Right-back is crucial to Chelsea's play, both going forwards and back. He dealt with Dwight McNeil ably and produced some good moments going forward, not least winning the penalty which Havertz converted to make it 2-1 to the hosts. Booked.
Wesley Fofana - 7.5.
A really classy player, Fofana received his first France senior call up this week. He played as though he will be staking a claim to be a regular starter for Didier Deschamps, showing poise and calmness on the ball, while seldom being beaten either inside or out by any of Everton's forwards.
Kalidou Koulibaly - 7.5.
Generally OK throughout, but culpable for the late equaliser. Trying to show Simms outside, he was beaten for pace and power by the young forward who duly dispatched his first and only chance. Question marks remain over his immediate future as a Chelsea player beyond this season. Booked.
Benoit Badiashile - 7.
It is any wonder why he was left out of the club's Champions League squad, but remains ever-present in their Premier League line ups. Has settled ably since joining in January. Had little difficulty up against Demarai Gray here.
Ben Chilwell - 7.5.
Like James, absolutely crucial to Chelsea and how they play. Brilliant for Chelsea's opener, finding Joao Felix with a cushioned pass. Caused Seamus Coleman trouble all day, and was Chelsea's most persistent attacking outlet throughout. Needs to stay fit.
Enzo Fernandez - 7.5.
Like Badiashile, has settled brilliantly since joining in January. No surprise with the Argentine, considering his performances in Qatar and obvious class. Everton's midfielders couldn't really get near him. Beginning to develop good relationships with Havertz and Felix in particular.
Mateo Kovacic - 7.5.
Becoming a crucial player for Potter. Scored last week, and probably should have done again here with first half volley he sent wide. When fit, few better midfielders in the division.
Christian Pulisic - 7.
Returning from an ankle injury that has kept him out since January against Leicester, the American was given an hour here. A few nice touches here and there, but struggled to really get into the game. One of those that could conceivably be looking for a new club this summer.
Joao Felix - 8.5.
A truly magical player who Chelsea supporters and players alike will be praying remains at the club beyond this season. Seems slightly inconceivable that his second half strike was his first at Stamford Bridge, but he mored than deserved it. Caused Everton bother all afternoon, with none of their defenders really knowing where or when to pick him up considering his propensity to pop up all over.
Kai Havertz - 7.
Now scored three in his last three with second half penalty that had looked to win the game for Chelsea. Starting to work the channels better and is becoming more and more comfortable in his hybrid nine-10 role every game.
Conor Gallagher (Pulisic 62') - 7.
One brilliant run after Everton had equalised when he evaded two or three opposition defenders. Hard to see where he fits with a Potter system, however.
Carney Chukwuemeka (Felix, 86') - N/A.
Ruben Loftus-Cheek (Kovacic, 81') - N/A.
Trevoh Chalobah (Fofana, 87') - N/A.
Manager: Graham Potter 7.5.
Beginning to look more comfortable in himself after positive few weeks. Clearly has the backing of the club, that much is clear - needs more results like Borussia Dortmund to win the backing of the supporters. Late equaliser will do little to shake feeling the side continues to have a soft underbelly when under pressure.
Jordan Pickford - 6.5.
Little he could have done for either goal. Felix's shot was hit with precision, going in off the post. Havertz's penalty was as cool as you like, sending the England 'keeper the wrong way. Had a decent command of his area. One great punch in added time when Chelsea were seeking a winner.
Seamus Coleman - 6.
His goal against Leeds last month will live long in the memory of Everton fans, particularly considering his status as one of the club's most pre-eminent players in recent years. Struggled here, however; his side appeared to be targeted with most of Chelsea's attacking output coming down their left through Chilwell.
Michael Keane - 7.5.
Has replaced Conor Coady at the centre of Everton's defence, and has proved more than capable. Like partner Tarkowski, he is willing to throw himself in front of anything and everything to keep opposition out. Lacks pace.
James Tarkowski - 8.
Generally assured throughout, other than when he brought down James to give away what was undoubtedly a stonewall penalty, despite his protestations suggesting otherwise. Commands Everton's back four though shorn of the armband. Culpable in spending a lot his time speaking (shouting) to the officials which can't always be helpful.
Ben Godfrey - 6.5.
Dealt with James better than Coleman dealt with Chilwell. He manages to get up and down well, pinning the England full-back back on occasion. Outlet at set pieces.
Idrissa Gueye - 6.
Struggled against the might of Chelsea's midfield. Everton tend to bypass the midfield with a lot of their play, with Dyche a proponent of going from back to front in a very direct manner. When he did get on the ball, he was often wasteful. Booked.
Amadou Onana - 6.
Probably Everton's best midfielder in terms of on the ball, but did not have many opportunities to showcase that at Stamford Bridge. Works extremely hard going forwards and back, crucial to the Everton press. Will be looked at by bigger fish this summer, you'd expect.
Abdoulaye Doucoure - 6.
Like Onana, he works incredibly hard for the team and was deserving of his goal. Dyche's arrival at Everton has been a blessing for the Mali international, having been essentially frozen out by Frank Lampard. Good header from Dwight McNeil's corner to grab their initial equaliser.
Dwight McNeil - 6.
Did not match last week's lofty achievements which saw him score the winner against Brentford. Worked hard, but found it difficult up against Chelsea's backline. One decent run in the first half that was snuffed out by Koulibaly in the end. Set piece delivery must be better. Booked.
Demarai Gray - 6.5.
Pressed and harried for not much reward. Gray, the club's top scorer this season with six in all competitions, had initially not appeared to be a Dyche favourite but Dominic Calvert-Lewin's ongoing injury woes mean the former Burnley boss has few other options. Good delivery from set pieces, including one free-kick on the right which was begging to be nodded in.
Ellis Simms (Gueye, 79') - 7.
Scored crucial equaliser at the death having shown impressive turn of foot, poise and power to get away from Koulibaly. Could be the man to score Everton some goals, finally.
Vitalii Mykolenko (Coleman, 84') - N/A.
Manager: Sean Dyche - 6.5.
Dyche's teams are not the prettiest, but they are extremely effective and very well drilled. This Everton side, in a matter of weeks, has the hallmarks of a Dyche team now to a tee. Survival is by no means guaranteed, particularly considering their struggles in front of goal, but he gives them a cracking chance.
Referee: Darren England - 6.
Nothing of note. Most interesting thing about his performance was that it was the first time he'd refereed at Stamford Bridge.