Mbeumo and Patrick Dorgu struck the goals on Michael Carrick's debut as United manager.
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"I think it's one of them," Mbeumo said when asked if this was the biggest day of his United career so far.
"Scoring in front of this stand is unbelievable. Derby is even more and like Licha (Martinez) said, we used the energy of the fans today. This place was unbelievable today.
"When I came back (from AFCON) a lot of things changed. I think we have a very good group. We always stick together. We have a fantastic unit, so it is unbelievable.
"It is a bit of everything. It is not easy because we only had three days. Because we are all together, we all want to win the same way with the same aim."