"It's nice to have three strikers scoring," Pearson told Leiester's official website. "Leo got another two – his all-round game I'm really pleased with, but for him to continue to score is important.
"For Nuge to get off the mark is important and for Vards I thought his goal is just reward for the sort of performance he put in.
"Whenever you've got pace in your side, no matter who you play against, there is potential for causing people problems and we've certainly done that throughout the game."
Leicester have moved up to seventh in the Premier League following the win, while United sit 12th.