Following his rookie season, Mascherin experienced a breakout sophomore campaign with points in each of his first eleven games. He was injured in his 12th game of the season but returned to the lineup after a few games and continued to register points. By December, Mascherin was second in team scoring with 14 goals and 20 assists and he finished the season with a total of 81 points in 61 games. As a result of his play, he was ranked 42nd amongst all North American skaters eligible for the 2016 NHL Entry Draft by the NHL Central Scouting Bureau. It was later debated amongst scouts that Mascherin was only ranked so low due to his height. He finished the season with numerous team awards including Les Bradley Memorial Award as the Most Improved Player and Jim Reilly Trophy as the Team Scoring Leader.