Bowen levelled with a deflected curling finish in the 65th minute at Hill Dickinson Stadium, where Everton had not previously conceded in competitive action since its move from Goodison Park.

Everton forced Alphonse Areola into two early stops, with the goalkeeper comfortably keeping out Beto and Iliman Ndiaye's efforts, but West Ham's set-piece problems soon showed again.

Areola was powerless as Michael Keane brilliantly headed James Garner's follow-up cross home, after West Ham only half-cleared the midfielder's initial corner delivery from the left-hand side.

Idrissa Gueye and Garner went close after the interval, though Jordan Pickford had to be alert after a slack Jake O'Brien header allowed Crysencio Summerville through on goal at the other end.

But West Ham, which appointed Nuno on Sunday, improved in the second half, and its persistence was rewarded just after the hour. 

El Hadji Malick Diouf's lung-busting run ended with a cross flicking through to Bowen, whose strike took a touch off Keane on its way into Pickford's right-hand corner.

West Ham captain Bowen saw another chance stopped by a last-ditch James Tarkowski block, while Garner’s fierce pile-driver was pushed away by Areola late on as both sides failed to find a winner.

The draw leaves West Ham 19th in the Premier League table on four points, while Everton moved to ninth on eight despite making it four winless games in all competitions.