Two goals from the former England forward helped the Red Devils to a 5-2 victory, but the success was not as one-sided as the scoreline suggests: the Iron took the lead after 19 minutes, had more possession and created more chances.
"Scunthorpe made a real game of it. They're obviously very fit and they never stopped going forward," Owen told MUTV.
"We scored five goals but they could have scored a few as well. It was a good game.
"It was a good workout and we're pleased to get through to the next round - especially seeing the other results [Chelsea, Liverpool and Manchester City knocked out]."