The 18-year-old signed for the Ligue 1 champions this summer and has started in sublime fashion.
Monaco cruised to a 3-0 friendly win over SKN Sankt Polten on Friday, and it was Mboula who scored the pick of the bunch.
After seeing Moussa Sylla and Rony Lopes give Leonardo Jardim's side the lead, the 18-year-old pounced on a loose ball after they cleared a corner.
Mboula charged forward from his own half with immense speed, leaving defenders in his wake before applying a simple finish.
It was an impressive start to life at Monaco for the youngster, who impressed in the UEFA Youth League with Barca last season, scoring eight goals in eight games.