Chris Wood came off the bench to inspire Burnley's second-half fightback which earned a 2-1 English Premier League win against Everton.
Wood, making his return after more than two months out with a knee injury, lost Ashley Williams to head the winner from a Johann Gudmundsson corner in the 80th minute.
Everton had been in a strong position to win the game at half-time, having taken a 20th-minute lead as Tosun guided a downward header past Burnley goalkeeper Nick Pope after Theo Walcott's cross had been glanced on by Seamus Coleman.
Burnley, seeking confidence after 11 league games without a win, might have wondered if they would be thwarted again, as Everton No 1 Jordan Pickford made four good saves in front of the watching England manager Gareth Southgate.
Pickford, a strong contender to start for his country when they play Holland and Italy in friendlies later this month, showed fine reactions to push away a Barnes chance in the first half, then keep out former Evertonian Aaron Lennon's first-time shot and Ben Mee's header soon after the interval.