Academy: Birmingham 0-5 VILLA
The 17-year-old forward volleyed home for the first in the 29th minute after a pinpoint free-kick from Barry Bannan.
He doubled the lead five minutes later when he slotted home from close-range - giving Tony McAndrew's men a 2-0 interval lead.
Ciaran Clark made it three in the 67th minute with a fierce header before Poyser completed his hat-trick from the penalty spot three minutes from time after a handball in the box.
Durrell Berry made it 5-0 a minute later with another header from close in to wrap up the comprehensive victory.
VILLA: Dau, Roome, Flanagan, Clark, Baker, Bannan, Forrester, Blythe, Collins, Poyser, Grocott. Subs: Berry (for Forrester), Dyer, Love, Deane.