The Bruins entered the Eastern Conference finals as heavy underdogs to the Pittsburgh Penguins, but they weren’t buying into that role.

And now we can all see why.

The B’s are two wins away from their second Stanley Cup final appearance in three years after a stunningly easy 6-1 victory at Consol Energy Center had them heading home with a 2-0 series lead.

After they won Game 1 by the score of 3-0, the Bruins said that they needed to be better in Game 2 — and were they ever. Brad Marchand scored two goals, and David Krejci and Nathan Horton also tallied, in a four-goal first period, and the B’s frustrated the Penguins all over the ice for the rest of the night.

The B’s have held a team that came into the series averaging 4.27 goals a game in the playoffs to just one goal in two games. Tuukka Rask made 26 saves in Game 2 and has stopped 55-of-56 shots in the series.

The B’s jumped out to a 4-1 first period lead, the second was quiet and Patrice Bergeron and defenseman Johnny Boychuk scored in the third as the visitors cruised to the win.

With Games 3 and 4 at the Garden Wednesday night and Friday, the Bruins have created a great opportunity to shock the hockey world.

“It’s going to be a challenge,” coach Claude Julien said of Game 2 after the morning skate. “They’re going to be a better team tonight. And we’re going to need to be a better team.”

Julien was only partly correct in his pregame assessment. While his own team was indeed even better than it was in the Game 1 shutout, Pittsburgh failed to answer the bell for Round 2. Things could not have gone much better for the Bruins in the first period. The B’s scored the first three goals and answered a late Penguins goal with another one of their own.

Just 28 seconds into the game, Marchand gave the Bruins a 1-0 lead on a breakaway goal. Sidney Crosby was at the blue line in the B’s zone and attempted a pass across to defenseman Matt Niskanen, but he fanned on it. Marchand was there to take the gift and sprint the distance, beating Tomas Vokoun with a wrist shot over the goalie’s glove.

The B’s got the only power play of the first and, while they didn’t capitalize on it, they scored just seconds after the advantage was up.