 He immediately established himself in the first-team and made 48 appearances in 2006–07, scoring two goals.In 2007–08, Mullins was described by manager Billy Dearden as the most improved player in League Two, and won Mansfield's Player of the Season award.Mansfield were relegated to the Conference Premier at the end of the season, prompting Mullins to turn down the offer of a new contract, as he wanted to stay in the Football League.