The broadcaster and journalist, 73, could not believe she won as she said that ‘this is one for the pensioners!’ on the show which will aired on Monday at 9pm on BBCOne.
She competed against actor Christopher Biggins, Radio 1 DJ Dev Griffin and TV personality Vicky Pattison for the title.
Winner! Janet Street-Porter has been crowned the first of two champions of BBC One’s Celebrity MasterChef Christmas Cook-Off in scenes set to air at 9pm, BBC One on Wednesday
Judges John Torode and Gregg Wallace returned to the MasterChef kitchen for the Christmas specials, bringing festive cheer to our screens.
After the initial shock of her win, the Loose Women panellist said: ‘No, I don’t believe it, I can’t believe it. I am really, really thrilled.
‘I did a lot of moaning but I loved the cooking part. This is one for the pensioners!’
Gregg, 56, said: ‘This has been brilliant fun. I think Janet’s pie was really clever and I loved the damson jam and venison inside.
Return: Judges John Torode and Gregg Wallace returned to the MasterChef kitchen for the Christmas specials, bringing festive cheer to our screens
Yum! Her winning menu started with a venison and damson Christmas pudding with seared chicory, caramelised carrot and butternut squash, brussel sprouts and gravy
‘It was absolutely stunning, brilliantly clever and showed the touch of a really, really good cook.’
John, 55, added: ‘This has been a fantastic celebration, we wanted a festive feast and that’s what all of the celebrities delivered.
‘Janet’s food didn’t just taste great but it looked great; it was care, it was attention, it was detailed, it was delicious!’
High praise: Of the meal, Gregg said this may be ‘the best dish you have ever cooked for me’
Wow! Janet’s food was incredibly detailed and served in such a way that it was sure to impress John and Gregg
Competition: She competed against actor Christopher Biggins (second from right), Radio 1 DJ Dev Griffin (right) and TV personality Vicky Pattison (second from left) for the title
Her winning Christmas-themed menu started with a venison and damson Christmas pudding with seared chicory, caramelised carrot and butternut squash, brussel sprouts and gravy.
Of the meal, Gregg said this may be ‘the best dish you have ever cooked for me’.
Janet then presented a damson fool mixed with damson plums served with almond biscotti, prompting John to hail it a success and saying: ‘I love it.’
Teamwork: For the Pairs Test, Janet teamed up with Christopher, 72, (pictured) to create a Pork Wellington
Did their best: Vicky, Dev and Christopher tried their best but couldn’t compete with Janet’s incredible menu
The final challenge followed the infamous Invention Test where the celebrities selected their ingredients from a season advent calendar.
For the Pairs Test, Janet teamed up with Christopher, 72, to create a Pork Wellington.
The second episode of Celebrity MasterChef Christmas Cook-Off will air on Wednesday December 23, featuring Craig Revel Horwood, Amar Latif, Crissy Rock and Spencer Matthews.
Socially distanced: The four celebrities remained in their separate stations for the show
Coming up: The second episode will air on Wednesday, featuring [L-R] Spencer Matthews, Crissy Rock, Amar Latif and Craig Revel Horwood