It took Bayern Munich just 30 minutes to kill off Lyon.
Gnabry scored the first in a fantastic individual passage of play after the French side let Bayern off on two occasions, through Toko Ekambi and Depay.
The Bavarian attacker himself showed that he is one of the most in-form players in the final third, after an inexplicable error from Lewandowski.
Gnabry started the move in the Lyon half and passed it to Perisic, who put in an impeccable cross to the back post. The Polish striker only had to tap it in, but hit it badly and Lopes was able to save it on the goal line.
Gnabry, who had followed the play, received the gift and put it into the net to make it 2-0 and make it practically game over.