Nick Phillips and Jamie Nagioff completed the scoring in Borehamwood.
The deadlock was broken 16 minutes in after a long-throw from Josh Cinna found the head of Cohen to make it 1-0 with his 25th goal for the club.
It was 2-0 before half-time, Joe Reece played the ball to Cohen who glided past three defenders showing great strength to hold them off before slotting it into the bottom corner.
The Dons had a respectable 2-0 lead going into the second half. Nick Phillips made it 3-0 shortly after the restart when he got his head onto yet another long throw from Cinna - great movement off the ball from Phillips left him completely unmarked in the box.
Cohen completed his hat-trick in the 66th minute after Adam Morrow went around the keeper and chipped him beautifully, with Cohen getting the final touch to take it over the line.
Faithfold managed to get one back five minutes later after a well hit strike from Ben Portnoi left Oliver Burchell with no chance.
But Cohen wasn't finished for the day though as he added his fourth just two minutes later, he managed to intercept a mishap in defence to leave him one on one with the keeper slotting it away with ease.
Part-time assistant-manager, part-time player and "part-time model" Nagioff then decided to get involved in the action as he made it 6-1 with just 10 minutes left to go. Harry Moss burst through the defence and his cross found Nagioff in the box who slid in to put the game to bed.
Faithfold claimed another goal through Yehuda Emanuel late on, another good quality goal which the Dons' defence couldn't really be held accountable for.
Delighted Dons boss Brandon Hamme told JC Sport: "What a performance from the boys yet again - the football was truly scintillating at times, it was superb from back to front throughout.
"There is a great hunger and desire within our squad and every week we show up desperate for a win. It's a very exciting time to be managing the side and I'm proud of what we have achieved so far this season, we can't get ahead of ourselves though but things are looking very positive. Up the Dons!
Faithfold for whom player-manager David Garson told JC Sport: "We couldn’t cope with their long throw and they were much stronger and faster than us and deserved the win. Good luck to them for the rest of the season."