A goal in each half for the young maroons put paid to a sterling challenge by Edina, who themselves showed plenty of skill and endeavour on the ball.
Tynie's Kyle Mitchell hit the opener on 23 minutes, knocking the ball past Edina goalkeeper Christopher Burt after a long ball into the box. Mitchell's teammate, Jason Kerr, attempted an ambitious overhead kick later in the first half, but saw the ball fly narrowly over the bar.
In the second half, Mitchell dinked a clever pass over the Edina defence for Shiells to run on to, but the subsequent shot was aimed square at Burt. The goalkeeper showed precise timing and decisive action a minute later to smother at the feed of Mitchell as the Tynie forward bore down on goal, and Burt then brilliantly tipped over a speculative 25-yard strike by Angus Luff.
Fifteen minutes from time, Tynie produced a two-goal cushion, after Euan Small's trickery on the left drew a foul and earned his side a free-kick. Robbie Ewing swung the ball into the box, and Shiells was well-placed to receive the ball and smash it into the net from six yards.
Tynecastle coach Simon Kinghorn felt his side, while not at their brilliant best, produced a professional performance to earn victory. "Workmanlike is probably the best word to describe our performance," he said.
Meanwhile, Ken Ritchie, chairman of the former Edinburgh and Lothians Youth Football Association between 1986 and 1988, was present at the 23rd cup final in his name.
"I was impressed by both teams' passing," he said.
Edina Hibs: Christopher Burt, Colin Parrott, Brandon Torrance, Paul Kennedy, Tom Alexander, Alex Fotheringham, Ryan Smith, Cameron Jeffrey, Conner Dyet, Callum McCabe, William Noble, Conner Lawrie, Lewis Mackay.
Tynecastle: Sean Brennan, Angus Luff, Max Michie, Danny Brooks, Blair Kinghorn, Callum Sutherland, Mark Shiells, Jason Kerr, Kyle Mitchell, Sam Daniel, Kyzer Summers, Jay Sturgeon, Jamie Troup, Robbie Ewing, Euan Small, Greg Kerr.