Mbappe curled in his eighth goal of the tournament on 60 minutes before Dembele doubled Les Bleus’ lead six minutes later to settle a clinical victory at the Gillette Stadium outside Boston.
The win sends the 2018 champions into the semi-finals for the third straight World Cup, where they will face either Spain or Belgium in Arlington, Texas next Tuesday.
“I think that is three consecutive semi-finals, so that’s already a good thing. It seems logical and natural, but you still have to achieve it,” France coach Didier Deschamps said.
“Obviously, I have great players, otherwise we wouldn’t get there, but it’s good.”
Mbappe was substituted in the 77th minute and said: “I have a minor ankle injury, but it’s fine.”
African champions Morocco had been tipped to pose a serious threat to France’s hopes of reaching a third consecutive World Cup final.
But Deschamps’ men were always in control against a limited Morocco side who failed to register a single shot on goal until an 83rd minute free-kick by Azzedine Ounahi was parried away by France goalkeeper Mike Maignan.
France though struggled to find a breakthrough, and missed the opportunity to take the lead on 28 minutes when Mbappe saw a penalty saved by Morocco goalkeeper Yassine Bounou.
Mbappe had won the penalty after being brought down by Noussair Mazraoui but was forced to wait several minutes before being allowed to take the kick after a protracted VAR check.
Morocco managed to hold out to half-time but it was always only a matter of time before France’s relentless pressure paid off.
The breakthrough came on the hour mark, with Mbappe bending a brilliant right-foot shot past Bounou from the edge of the area.
Paris Saint-Germain star Dembele made the game safe in the 66th minute, striding forward menacingly from midfield before steering a low finish into the bottom corner.
Deschamps said he had never doubted Mbappe’s confidence in front of goal despite the penalty miss.
“When it’s Kylian, there’s no problem. He never doubts himself,” Deschamps said.
“It’s great; we’re where we wanted to be, so we’ll recover well and then we’ll see who our opponent is tomorrow,” Deschamps added, referring to Friday’s meeting between Spain and Belgium in Los Angeles. (AFP)
