Town raced into a commanding 5-0 lead at half-time thanks to goals from Owen Dean, Adam Liddle, Shamal Edwards (2) and Harry Cooksley. Lewis Flatman, Joe Jackson and Kai Tanner got on the scoresheet in the second half as the home side ran riot.
“Millbrook tried to make it difficult for us and kept going, to be fair – but we were good,” said Johnson.
“At half-time the message was to keep the standards up, and we managed to get another three goals.
“The substitutes came on and all made an impact, which was pleasing. We have great options – I just need to make sure I keep everyone happy.
“Darryl Sanders and Lewis both got their first minutes coming back from injury – which was pleasing – and Adam got his first goal since joining the club. He’s up and running now and I’m sure it will be the first of many.
“Owen was a threat throughout and was named player of the match. He made his goal look easy, but it was a difficult technique.
“Pat Nash had a very quiet afternoon in goal, apart from distributing the ball.”
Town’s reward for beating Millbrook is a home tie against RB Kensington in the first round proper of the FA Vase on Saturday, October 21.
Farnham return to Combined Counties Premier Division South action on Saturday, with a trip to Fleet Town for an eagerly-anticipated local derby (3pm).
Johnson’s side have won their first five league games this season – scoring 18 goals without reply – but they have slipped to third place because of their impressive exploits in the FA Cup and FA Vase.
Farnham trail leaders Jersey Bulls by four points – but have four games in hand – and Johnson is looking forward to getting back to league action.
“The league is the priority,” he said. “We’ve got the cup game against Horley on Tuesday, but then have a good run of league games.
“We’re looking forward to getting back to the league.
“Fleet is a derby so anything can happen and we need to make sure we are on our game.”