Palace recorded a league double over United for the first time in the club's history.
Speaking to Sky Sports, Olise smiled: "I think it's a good night.
Obviously, we've been working hard and focusing on ourselves and we know what we can bring to the table when we're at home. The fans were behind us so I just thought: 'let's go.'
It could've been (a hat-trick). Probably (should have been)!"
As for his teammate Eze, Olise noted: "He's a top player. He's got quality, dribbling, finishing, everything.
I think we've played together for a whole month now, not as much as we've wanted to, but when we do play together, we enjoy it a lot."
Eze reciprocated that praise, saying of Olise: "He brings a lot (to the team). You can see from his two goals today the quality he has got.
You want to play with players like this and the quality he has got is incredible, so we enjoy playing together."