Braga reached its first European final when it beat Benfica 1-0 and advanced on the away goal rule in the Europa League semifinals on Thursday.
Custodio Castro's first-half goal left the two-leg semifinals on a 2-2 aggregate.
Braga will meet FC Porto in the first all-Portuguese final in Dublin on May 18.
Unheralded Braga was the underdog again but added Benfica to earlier triumphs over Liverpool, Arsenal, Celtic and Seville on its unprecedented run.
Castro, a Portugal defender, rose above the defense in the 19th minute to head in a corner.
''We're heroes, the fans' heroes,'' Castro said. ''Words can't describe this joy.''
Braga, which lies third in the Portuguese league, 14 points behind second-place Benfica, was the more composed team as it looked to overturn the first-leg 2-1 deficit.
Only one European opponent - Shakhtar Donetsk - managed to find the net at Braga's stadium this season.
''We've got a great group of players. They give everything for each other. I'm so proud of them,'' Braga coach Domingos Paciencia said.
Benfica, whose European glory days were in the 1960s when it was back-to-back continental champion, was unbeaten in the tournament this season. It sought its first European final since 1990.
''We had several good chances to level the score. We did everything we could,'' Benfica coach Jorge Jesus said. ''We're disappointed, but we fought and worked hard and kept on trying.''
The all-Portuguese encounter featured more grit than flair even though Braga started with five Brazilians who have been a mainstay of the club's success in recent seasons.
Lima beat Luisao to Albert Meyong's cross in the 10th minute, deflecting the ball over the goal before Braga goalkeeper Artur Moraes tipped a Carlos Martins free kick over the bar.
Benfica lifted its game after the goal and Silvio's low drive just missed on the half-hour, while Javi Garcia should have made more of a loose ball at the other end.
Before the interval Javier Saviola hit the post as Benfica signaled the contest wasn't over yet.
Benfica replaced midfielder Cesar Peixoto with striker Franco Jara as it went in pursuit of the equalizer during a tense second half, but Braga looked the most dangerous and Mossoro beat two defenders as he broke into the area before shooting weakly.
Benfica squandered some late chances, Moraes denying Nicolas Gaitan from short range and Saviola failing to tap in a stray ball at the back post.
But the Eagles faded towards the end, with goalkeeper Roberto denying Hugo Viana and Castro in late action as home fans at Braga's prize-winning stadium - built in a disused quarry - celebrated.
