Everton boss Carlo Ancelotti said the Toffees "are back" after a howler from Arsenal's Bernd Leno gifted his side a crucial win in their bid for a Champions League place.
The Merseysiders had failed to win in six games in all competitions but moved to within three points of the top four with a victory which was achieved amid a backdrop of protest.
Over 1,000 Arsenal supporters gathered outside Emirates Stadium to show their anger about owner Stan Kroenke's role in the failed European Super League.
The goal came when Everton forward Richarlison tried to roll a pass across the six-yard box.