The Wales striker tucked away his 12th goal of the season to secure a 2-1 victory for in-form Millwall, who continue to close in on the npower Championship play-off places.
Jewell, who was in the stands to watch the stunning midweek Carling Cup win over Arsenal, took charge of Town for the first time and saw Wednesday's goal hero Tamas Priskin fire his new side ahead.
But Millwall hit back before half-time through Danny Schofield, and Morison made up for a dreadful first-half miss with the winner to extend their unbeaten run in the Championship to nine matches.
Jewell predictably named the same line-up that saw off the Gunners as he returned to the dug-out for the first time in more than two years.
Source: PA
Source: PA