Paris St-Germain back to winning ways with a win against Brest that extends their lead at the top of Ligue 1 to 11 points.
PSG was missing other key players like Lionel Messi and Neymar, but they were still much superior to their opponents.
Mbappe opened the scoring with a strike from the outside of the box, his 19th of the season and tenth in the league.
Thilo Kehrer sealed the victory with a magnificent side-footed volley from Nuno Mendes’ cross.
This was the defender’s second league goal in a row after he equalize against Lyon last Saturday. He had previously scored only two goals in 70 Ligue 1 outings.
The victory extended PSG’s undefeated Ligue 1 record to 12 games, although it was just the club’s second in the previous six.
They have seen significant disruption to their glittering side, with Neymar injured, Messi testing positive for Covid-19, and players such as Achraf Hakimi and Idrissa Gueye competing in the Africa Cup of Nations.
Despite this, their starting XI remains the envy of the rest of France, and although it was not flawless on Saturday, it was superior.
They have developed a habit of conceding first in recent weeks and would have done so again had it not been for Gianluigi Donnarumma’s superb save to deny Irvin Cardona following Presnel Kimpembe’s misjudged backpass.
However, after surviving that scare, they grabbed control and took the lead thanks to Mbappe’s slick inside cut and fantastic low finish.
Marco Verratti’s toe-poke effort struck the inside of the far post early in the second half before Kehrer’s strike gave the hosts a more comfortable final 35 minutes, which included a late cameo from Sergio Ramos.