Former Wales and British & Irish Lions ace Powell had said winning with Brecon at the home of Welsh rugby would be one of his best achievements and so it proved.
Full-back and man of the match Crockett did the damage for Powell’s outfit as he crossed for a stunning treble.
Bonymaen did launch a stunning comeback against the odds, but despite a fine kicking display Richard Cunniffe missed a crucial penalty late on.
Nathan Eager and Jack Davies scored Bonymaen tries.
Brecon were ahead with less than three minutes on the clock. Bonymaen didn’t deal with a loose ball following a kick and Crockett capitalised.
Dean Gunter nailed the conversion and Brecon were dominant with their scrum on top early on, though Gunter was unable to extend their lead with a penalty.
Bonymaen full-back Lawrence Thomas made one break and also failed with a monster penalty effort, but fly-half Cunniffe did succeed with a long-range kick.
Gunter made it 10-3 to Brecon with his first penalty of the afternoon following yet another scrum surge from the men in white and a second try soon arrived.
Gunter spotted space out wide and spread the ball left with a long pass.
Crockett was the beneficiary as he grabbed his second and although Gunter couldn’t convert, his team were now 15-3 up.
Bonymaen were dealt a further blow before the break with lock Kim Kelly yellow carded for a deliberate knock on, but it couldn’t stop Cunniffe from kicking a second penalty with the last kick of the first half.
It meant his team trailed 15-6 as they turned around.
Cunniffe chipped away at Brecon’s lead again at the start of the second half.
Still, he couldn’t stop Brecon as Crockett made it a hat-trick following fine approach work from outstanding No 8 and captain Ewan Williams.
Bonymaen pulled one back though scrum-half Nathan Eager as he crossed off the back of a neat line-out move. Cunniffe converted to give his team hope.
Both teams unloaded their benches in search of fresh legs and Gunter kicked a penalty at the start of the final quarter.
Bonymaen then kept the drama going with a try from Jack Davies and although the conversion was missed, they were now within two points.
Gunter couldn’t settle Brecon nerves as he missed another penalty and Cunniffe then stuck the post with a penalty which would have put Bonymaen ahead for the first time.
It was a lucky escape for Brecon who then used their forwards to keep possession at the other end and hold out for victory.
Scorers:
Brecon:
Tries: Jake Crockett (3)
Conversions: Dean Gunter
Penalties: Dean Gunter (2)
Bonymaen:
Try: Nathan Eager, Jack Davies
Conversion: Richard Cunniffe
Penalties: Richard Cunniffe (3)