During the 2013–14 season Vernon scored a hat-trick against Falkirk, on 25 September 2013, as Aberdeen won 5–0 in a League Cup tie. In the 2014 Scottish League Cup Final, Vernon came on as an extra-time substitute and scored in the penalty shoot-out to help Aberdeen win their first trophy for 19 years. He then scored his second hat-trick of the season on 6 May 2014, in a 3–1 win away to Dundee United. Vernon left Aberdeen when his contract expired at the end of the season, having not been offered a new one by manager Derek McInnes.