Owen Farrell kicked 20 points in a near-flawless afternoon, while referee Nigel Owens awarded a penalty try against an Irish scrum that was obliterated from start to finish before Ben Youngs completed the rout with an opportunist late try.
Lancaster told BBC1: "We were outstanding. I'm really really pleased with the performance. Today was difficult but we were outstanding in every department."
He added: "At the outset there's a long-term plan, and that revolves around giving a load of young players some experience. I think a lot should be made of their self-belief, they believe in the team, they believe in the direction they're going, they believe in the coaches and it showed today."
Asked how much he wanted to remain as England boss, he added: "That's for others to decide, but if you said to me I'd be walking around Twickenham applauding 82,000 people with a group of lads I respect and a management group I respect I would have taken it."
England number eight Ben Morgan added: "Performing like that against a tough, tough Ireland side is just incredible. The group has come together, the team that Stuart has brought in for us has made us grow."