The former Annan Athletic forward has been in sensational goalscoring form for the Citizens, scoring 38 times in all competitions and weighing in with 30 goals in League 2.
Henderson’s haul helped James McDonaugh’s men top the table for long spells – they eventually finished third – and reach the semi-finals of the IRN-BRU Cup.
The 24-year-old is set to share the inaugural SPFL Tartan Boot award with Raith Rovers forward Kevin Nisbet, who also bagged 30 league goals this season.