LOAN WATCH: Musonda starts as City hammer Hemel
The 20-year-old played from the start, in front of ex-Town keeper Craig King, with the side captained by former Luton midfielder Godfrey Poku.
City led through Reece Fleet (16) and Christian Oxlade-Chamberlain (24) at half time, with the visitors down to 10 men as well.
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Hide AdHemel pulled one back, before Poku (78) and Sam Nombe (83) completed the scoring.
Keeper Harry Isted was between the posts for Chesham as they were held to a 2-2 draw at home by Dorchester Town in the Southern League Premier League.
The Generals, who had ex-Hatter Adam Watkins in their ranks, went ahead when Benji Crilley scored on 40 minutes.
They fell 2-1 down in the second period, only for Ravi Shamsi to earn a point with eight minutes to go.
Young full back Jack James had the full 90 as Hitchin Town went down to a 3-1 home defeat to Farnborough in the same division.