It was Wales' 26th Championship title in the tournament, equalling England's haul.
Wales staged a dramatic comeback after their opening
30-22 loss to Ireland
in the Six Nations opener - at the time an eighth defeat in a row.
Howley claimed he was confident Wales would bounce back from that defeat and reiterated his belief that the 2012 Grand Slam champions had not become a bad team despite their run of defeats.
Wales had lost their summer Test series 3-0 to Australia down under and suffered a clean sweep in their autumn Test series, with defeats by Argentina, Samoa, New Zealand and Australia.
"We kept on sending the message that good teams don't become bad teams overnight," said Howley.
"We were consistent with that message and the players have gone out and delivered.
Highlights: Wales 30-3 England
"The Millennium Stadium is a unique place in world rugby and we felt with our experience, with the crowd behind us, we needed to start well.
"The first 20 minutes was the foundation."
Howley paid tribute to England after the full-time whistle and revealed Wales had designed a high-tempo game-plan to test England's fitness after they only had six days to prepare for the title-decider in Cardiff.
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