A hat trick from Thiago ensured that the dominant winners stormed into the lead despite goals early on and late in the game from the runners-up in Israel.
Isco, who is the player of the tournament for his performances throughout the event including grabbing a goal in the second half of the final, admitted he was surprised at how strong his team were en route to another Under-21 title.
"The most important thing is to win the championship. It's a wonder how strong we have been in this tournament. We are very happy," AS quoted the attacker as saying.
The 21-year-old also clarified who the team's primary penalty-taker was after Thiago was given the duty to complete his hat trick in the opening 45.
"It was agreed from the start of the competition that we would each take a penalty if we got two in a game," he added.
Meanwhile, final hero Thiago - who was also present for his country's last success in this competition two years ago - was quick to share the plaudits with his team-mates and expressed satisfaction having won the tournament the tika taka way.
"Our success comes from the goals of [Alvaro] Morata, Isco and Alvaro Vazquez who have all lead us to winning this tournament again," said the Barcelona youngster. "The most important thing is to show the world tika taka football."