Mahon took centre stage in the competition in 2014-15, scoring the winner at Southend United the day after his wife gave birth to twins and then starred in the goalless draw at Barnsley in the second round.
His performances earned him praise from football fans and pundits, and even led to an appearance on BBC television for the Irishman.
For the down-to-earth Dubliner, the FA Cup has been a source of memories to cherish and he's eager to create more this time around.
Mahon wants to help the Blues reach the third round for the first time as a supporter-owned club and give them a chance of drawing a Premier League club.
But the 26-year-old recognises Chester's immediate focus must be this weekend's trip to Altrincham on Saturday (3pm) in the fourth qualifying round.
"The FA Cup is magical and things happen for a reason," said Mahon.
"I had a great time last year with the boys being born and then scoring at Southend so I can't wait for it.
"I think everybody at the club wants to make history and obviously we did that last year with getting to the second round.
"It was a fantastic day at Barnsley and I thought we should have won it really but hopefully we can go a step further and get one of the big clubs.
"If we can do that it's going to help the club and that's what really matters so it keeps us in good stead, lets the gaffer bring players in and it's a great confidence boost.
"We've got to take it one game at a time though so we need to focus on getting past Alty and into the next round."
The current season had been disappointing for Chester but back-to-back wins suggest a corner is being turned, even though performance are still unconvincing.
Mahon made his first start since the 3-0 defeat at Bromley in late September as the Blues overcame FC Halifax Town 2-1 on Saturday.
Altrincham conceded a last-gasp equaliser in a 2-2 draw at Gateshead and Lee Sinnott's side are 19th in the National League table.
Mahon sees similarities between this weekend's tie and last season's 4-2 win at Stockport County at the same stage, and he reckons the Blues are capable of getting the result and putting themselves in the hat for the first round.
He said: "I think against Alty is going to be a tough one and similar to Stockport last season but if we knuckle down and get our confidence back I think we can get through to the first round and hopefully get a good draw."