Mabaso bolstered his tally with a brace in his side's 6-3 loss to Baroka on the final day of the campaign on Sunday.
The 20-year-old's efforts helped Phunya Sele Sele finish second in the PSL Reserve League standings with 30 points from 15 games - four points behind champions Mamelodi Sundowns.
Highlands Park's Muzi Thabotha was next best with 10 goals, while Orlando Pirates' Grant Peters, Sundowns' Keletso Makgalwa and Free State Stars' Thabo Maphakisa netted eight times apiece.
Kaizer Chiefs forward Emmanuel Letlotlo was the MDC's leading marksman last season with nine goals.