Albion look to make it back-to-back Premier League wins after last weekend's win at Southampton.
Newcastle are without a win in their last four, but have drawn their last three, against Wolves, West Brom and Villa.
Trossard finds the bottom right corner from 20 yards just before half-time, before Welbeck scores a carbon copy six minutes after the restart.
Maupay adds a third midway through the second half from Gross' cross.
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