A goal and assist from Natasha Dowie helped put Everton through to the semi-finals of the Continental Cup.
The Merseyside club won here on the final day of the season 3-1, Dowie scoring the third, and she put on another assured display to help her side progress.
It had been raining heavily all afternoon but the weather calmed as the game kicked off.
And the wet surface led to an early scare for Everton; Helen Lander chased down a loose back pass from captain Becky Easton and although she managed to block Rachel Brown's clearance, Lucy Bronze managed to clear the ball second time of asking.
But it was the away side that took the lead on the fourth minute. From a Chelsea free kick Everton broke quickly and Dowie squared the ball for Gwennan Harris to take a touch and fire past Sarah Quantrill.
Everton should have doubled their lead when Dowie beat the offside trap but she couldn't find her way past Quantrill who made herself look big and kept the shot out.
However, they did double their lead midway through the first-half when Quantrill's heavy touch from a simple back pass was pounced upon by Dowie, who rounded the goalkeeper and passed the ball into an empty net.
The first-half ended with the away side on the front foot and they should have killed the game off if it wasn't for some last ditch defending and the crossbar coming to Chelsea's rescue.
Everton continued where they left off in the first-half with some slick one touch passing and but it was the home side who came closest to scoring.
Ashlee Hincks capitalised on another poor back pass and although she rounded Brown, only a spectacular goal line clearance denied a certain goal.
From the resulting corner substitute Drew Spence narrowly headed over.
However Everton punished Chelsea when from a Williams corner, Danielle Buet unfortunately headed into her own goal.
And it was soon four when Everton broke away down the right-hand side. Dowie's first shot was well saved by Quantrill but Michelle Hinnigan scored from the rebound.
With 10 minutes to go, Brown pulled off a terrific save from close range to keep her clean sheet in tact.
CHELSEA: Quantrill; Buet, Davies, Bonner, Perry; Moorwood (Hills 46), Champ, Coombs, Hincks (Longhurst 82); Jane (Spence 55), Lander
Subs not used: Fay, Cole,
EVERTON: Brown; Easton, Whelan, Bronze (Johnson 43), Unitt; Duggan, Scott, Williams (Chaplen 76), Harries (Handley 46); Dowie, Hinnigan
Subs not used: Hill, Kane
Goals: Harris 4, Dowie 29, Buet OG 65, Hinnigan 69
Ref: P Forrester