Wycombe caused a huge Carling Cup second round shock to dump Premiership side Fulham out at Craven Cottage.
Easter (left) was involved in both Wycombe's goals
The visitors went ahead after eight minutes when Jermaine Easter buried a rebound chance after keeper Jan Lastuvka saved Matt Bloomfield's shot.
The Chairboys made it 2-0 when Carlos Bocanegra felled Easter and Tommy Mooney netted from the spot.
Heidur Helguson, who twice went close in the first half, headed in Fulham's goal two minutes after the break.
The Londoners, fielding a much-changed side from the one that drew with Tottenham on Saturday, began promisingly.
But Easter fired home the League Two side's opener from 10 yards after Michael Timlin lost possession.
Bloomfield was set through on goal, and although debutant keeper Lastuvka saved the intial shot, Easter reacted quickly to bury the follow-up.
Helguson then headed a glorious Wayne Routledge cross over the bar and had a shot cleared off the line by Vincent Fernandez.
Jamie Young also kept out a Tomasz Radzinski shot as Fulham piled forward but Wycombe held firm and doubled their lead five minutes before the interval.
Bocanegra brought down Easter and veteran striker Mooney lashed home the resulting spot-kick.
Fulham improved after the restart and were back in the game within two minutes when Helguson headed in following Bjorn Runstrom's cross.
And the home side continued to create chances with Radzinski shaving the post with a shot and Runstrom missing an open goal.
But League Two leaders Wycombe withstood all that Fulham could throw at them to book their place in the third round.
Fulham: Lastuvka, Volz, Zakuani, Bocanegra (Omozusi 58), Niclas Jensen (Rosenior 65), Routledge, Claus Jensen, Timlin, Radzinski, Runstrom (John 78), Helguson.
Subs Not Used: Crossley, Collins.
Booked: Timlin, Runstrom.
Goals: Helguson 47.
Wycombe: Young, Williamson, Antwi, Grant, Palmer (Doherty 72), Golbourne, Betsy, Bloomfield, Fernandez (Martin 61), Easter, Mooney (Dixon 89).
Subs Not Used: Gregory, Anya.
Booked: Grant, Martin.
Goals: Easter 8, Mooney 41 pen.
Ref: A Hall (W Midlands).