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Last year the 43-year-old Countryfile presenter left the BBC show after nine years without explanation, bowing out over video call on 31 March, 2020, while in self-isolation at home during the first national lockdown.
Baker told This Morning: "It was a year ago to the day. I said goodbye and shut the laptop and that was that."
He added: "It was propped up on an ironing board."
Watch: Alex Jones is pregnant!
Baker has now become a full-time farmer after moving back to his parents' home in the Durham Dales to help out when his 65-year-old mum Janice was injured in a farming accident in July last year.
The former Blue Peter presenter insisted he had always felt more at home outdoors than interviewing A-list stars in a studio.
He said of his new life: "To be fair it's what I was always doing that when I was on The One Show – I was forever scraping all the mud off and then going to interview George Clooney."
Baker added: "Everybody's lives have been turned upside down [by the pandemic], I kind of feel like everybody else really.
"This is my life, this is who I am."
And he revealed the last person he shook hands with before social distancing rules came into place was Hollywood star Steve Martin, when interviewing him for the show.
He recalled: "The last person I shook hands with was Steve Martin. I shook hands with him and said, 'We'll never be allowed to do that any more.'"
Baker has made a More4 documentary series starring his parents, wife Nicola and two children, Molly, 11, and Luke, 13, about their new rural life, called Matt Baker: Our Farm In The Dales.
But he told Phillip Schofield and Holly Willoughby he hasn't retired from TV forever.
Baker said: "I'm passionate about programme-making – I've loved it ever since doing children's TV. It was what I always wanted to do and keep doing."
The TV presenter is set to re-join The One Show co-host Alex Jones in the studio on Wednesday evening to mark the anniversary of his departure and discuss his new life on the farm.
Watch: Alex Jones makes slip-up on The One Show