The Mets rotation got healthier Saturday night, with Taijuan Walker returning and continuing to dominate like he did before he joined a crowded injured list.

The Mets lineup remained beat-up, but the rag-tag group of hitters and two underperforming stars came together for an offensive explosion anyway.

Walker delivered five shutout innings and the bats took care of the rest, teeing off on the Braves for five home runs in their fourth straight win, 13-2, on a chilly night at Citi Field.

James McCann led the charge with a four-hit effort, adding two RBIs and two runs while falling a triple short of the cycle. The first baseman hit the Mets’ first home run of the game and Francisco Lindor crushed the last — an encouraging performance for the two big offseason acquisitions who have largely struggled to begin the season.

“It’s taken us a while to put together a game like this, but being able to put up runs and guys coming through in big spots … everyone contributed,” McCann said. “That makes it a lot of fun in the dugout.”

Jonathan Villar, Brandon Drury and Billy McKinney also homered for the Mets, who piled up a season-high 13 runs on 13 hits to turn a tight game early into a laugher.

Every Mets starting position player had at least one hit, including Cameron Maybin. The center fielder snapped an 0-for-27 start — the longest hitless streak to start a stint with the Mets in franchise history — with a squibber down the third base line. McCann called it his favorite hit of the game and it started a seven-run rally in the sixth inning.

“It builds a lot of confidence from the offensive standpoint,” manager Luis Rojas said. “That’s something we hadn’t done in the season so far.”

The Mets (25-20) extended their lead atop the NL East, now leading both the Braves (24-26) and Phillies by a season-high 3.5 games. Between injuries and a lack of production from their stars, little has gone according to plan so far for the Mets, and yet their strong pitching has largely been the backbone for their claim to the top spot in the division.

Walker continued that trend Saturday, picking up where he left off by striking out eight and allowing just three baserunners while lowering his ERA to 1.84 through nine starts.

The right-hander was activated off the injured list before the game to make his first start since May 17, when he left a game in Atlanta after three innings with left side tightness. He had settled into a groove before the injury and fell right back into it Saturday as he allowed one run or fewer for the fifth time in his last six starts.

“I felt great,” said Walker, who still did not swing in any of his at-bats as a precaution for his injury. “That last inning felt really good, felt like I was under my legs a lot more. The offense did a really good job today too, so took the pressure off me and I was able to go out there and attack the zone.”

Walker finished the fifth inning with back-to-back strikeouts, protecting a 2-0 lead. The Mets then added a pair of runs in the bottom of the inning, one on Villar’s fifth home run of the month, before going off for seven runs in the sixth — by far their biggest inning of the season. Before Saturday, the Mets had only scored seven or more runs in an entire game just four times this season.

“It’s great to see different guys contributing,” Rojas said. “It’s a really good example for the guys to slow things down offensively and be able to translate that into the next day. That’s what we got to do now.”