Both Aubameyang and Lacazette started together in the win over Newcastle last weekend and were both in the XI again after Lacazette dropped out for Thursday’s 4-2 Europa League win over Vorskla Poltava.
Torreira was an injury doubt for the visit of Everton after ending the win over Vorskla with an ice pack on his right knee following two heavy challenges from opposition defenders.
But he shook off the knock to make his first start in the League since joining the Gunners in the summer.
Henrikh Mkhitaryan, who also suffered an injury in Thursday's Europa League win, did not recover in time to make the squad.
Arsenal: Cech, Bellerin, Mustafi, Papastathopoulos, Monreal, Torreira, Xhaka, Ozil, Ramsey, Aubameyang, Lacazette.
Subs: Elneny, Lichtsteiner, Holding, Iwobi, Leno, Welbeck, Guendouzi.
Everton: Pickford, Kenny, Keane, Zouma, Digne, Gueye, Davies, Walcott, Sigurdsson, Richarlison, Calvert-Lewin.
Subs: Holgate, Baines, Tosun, Schneiderlin, Bernard, Stekelenburg, Lookman.