The comedian impressed viewers at home when he created a biscuit of the Duchess of Cornwall, formally known as Camilla Parker Bowles.
Assigned with recreating their favourite days in the form of a biscuit, Harry choose to bake his “holiday with Camilla Parker Bowles”.
Speaking to judges Prue Leith and Hollywood, he said: “This was a holiday that I had with Camilla Parker Bowles on an exotic island, which shall remain nameless.”
Chuckling, Prue replied: “I think it is absolutely amazing!”
“Amazing good or amazing weird?” Harry asked.
“Amazing good, it’s terrifically complicated,” Prue offered, before joking: “This is definitely a recognisable portrait.”
Harry then went on to explain all the pieces from his 3D biscuit creation, telling the judges that a wise turtle had joined him and Camilla on the beach.
The 53-year-old received rave reviews for his royal-infused snack and even went on to win the Celebrity Bake Off star baker prize.
However, it was his hilarious story that had viewers at home laughing, with many taking to Twitter to comment on the comical moment.
One wrote: “Cried with laughter at Harry Hill’s 3D biscuit sculpture of his holiday with Camilla Parker-Bowles.”
“Harry Hill’s biscuit depiction of his ‘holiday’ with Camilla Parker Bowles was the funniest thing I’ve seen for ages,” added another.
A third gushed: “Living for Harry Hill on #celebritybakeoff.The Camilla Parker Bowles biscuit is the best damn thing I have ever seen.”
While a fourth commented: “I am loving Harry Hill’s story about his holiday with Camilla.”
Meanwhile, Bill, who recently revealed he has prostate cancer, blew the judges away with his colourful biscuits.
However, Prue was left slightly disappointed that she could not taste the honey flavouring in the baked goods.
The Great Celebrity Bake Off for Stand Up To Cancer returns next Tuesday on Channel 4 at 8pm.