The on-loan 20-year-old Bournemouth youngster launched a rocket into the top right corner to win the game for Yeovil, and to take his own goal tally to three for the season, labelling it one of the best of his career.
"It was one which you don't score very often," Cornick told the Western Gazette after the game.
"I've scored a couple like that in training but never in first team football. It's probably one of the best goals I've scored so I'm very pleased with that one."
The win lifted Yeovil out of the relegation zone and into 20th place on the League Two table.