The Vikings Academy grabbed five of the night's tries as Lawton's hat-trick was backed up by a double from young winger Jack Owens.
The home side were 16-0 up at the break and in control but had to fend off a second-half rival from the bust-up Broncos to secure victory.
The visitors were without star five-eighth Jamie Soward (fatigue), stand-off Michael Witt (calf), captain Tony Clubb (knee) and winger Michael Robertson (hip and knee).
Coach Tony Rea, perhaps with one eye on the Challenge Cup semi-final with Wigan next week, brought on-loan forward Jacob Fairbank, who was ineligible to play against Sheffield last week, into his starting 13, while centre Ryan Shaw, who has joined on loan from Swinton, was handed a debut.
Betts said: "We needed a win. That over anything else was really important. We wanted to keep their score down and get the job done ourselves. We delivered and to be honest we could have scored more.
"Adam Lawton has always had potential. He's a big lad with lots of skill but there a lot of work to do still. We have a good future with the likes of him, Jack Owens and Grant Gore coming through.
"There was a little bit of inconsistency there in our game but overall I'm pleased. We have to make sure we are tight in certain areas, we still have to improve. What you see is what you get with our lads. Sometimes we fall short but it's not through lack of trying."
Rea bemoaned the number of changes he had to make. He said: "We spent the first half adjusting to late changes in our team. We spent the half getting to know each other. We didn't deserve it tonight. We chased the game and got caught out.
"The Challenge Cup game with Wigan is another day. We had our eye on this game with Widnes but it's this time of the year, teams have injuries. If it was a final some of them would have played but no one was rested tonight."
- Sports & Recreation
- Michael Witt
- Tony Clubb