Five minutes later and United succeeded in finding a third goal when Amad beat Wady from the edge of the area with a masterful curling free-kick.
It really was a sublime left-footed strike from the Ivorian and put to rest any hopes of a Chelsea comeback.
With less than 10 minutes remaining, the Reds rounded off a highly satisfactory performance with a fourth goal, set-up by Martin Svidersky and scored by Helm.
Substitute Henry Lawrence then netted a consolation in added-on time from a rare foray forward from the London side.
United: Bishop; Wellens, Fish, Devine, Williams (Fernandez 78); Helm, McCann; Shoretire (Svidersky 78), Hannibal, Amad; Elanga.
Substitutes not used: Mastny, Hoogewerf, Savage.
Goalscorers: Shoretire 45, 45+5, Amad 70, Helm 81.