The goals were scored by Mitch Hancox, Andy Shinnie, Liam Truslove and Shane Ferguson.
"It was a comprehensive win and a good performance," said Beale (pictured).
"I was really pleased with the way the lads applied themselves and the football they played in difficult conditions. We made a very good start and were on the front foot from the first whistle and 2-0 up within seven minutes.
"The lads applied themselves in the right way and we defended aggressively from the front to the back. There is no substitute for hard work and everybody worked hard, contributed to a good team performance and got their rewards.
"What particularly pleased me was that we kept a clean sheet and it was great for 17-year old Connal Trueman goalkeeper who was making his U21s league debut."
The game also saw a return to action for Jonathan Spector. The American international played an hour, for the first time since sustaining a thigh injury last October and had no ill effects.
"Jonathan Spector played for the first time in a long time and it was like he hadn’t been away," added Beale.
"There were no after effects and it looked like he could have gone on longer. I know he really enjoyed it."