The King was cheered by Morrisons workers after he wished them an early “happy Christmas” at the beginning of a two-day tour of Yorkshire.
Charles toured the Bradford HQ of the supermarket giant as hundreds of staff watched from balconies and stairwells.
As he arrived, he chatted to people who worked at stores around the region, telling them: “Thank-you for your wonderful efforts.
“I hope they let you off at Christmas.”
Later, in a short speech, he told the staff: “It’s a great joy to see you all today.
“I had no idea quite how many of you worked here at Morrisons.”
After discussing his tour and work he had heard about in the community, the King said: “I can only thank you for all that, wish you every possible success in the future and, eventually, a really happy Christmas ahead.”
The King was given tips on roasting potatoes as he toured the development kitchen at Morrisons, examining special dishes prepared from triple-smoked salmon and pan-roasted short-horn beef by chefs Mark Richmond and Richard Jones.
He talked to a variety of producers about sustainable livestock rearing and current issues in farming.
As he was introduced to producers of recently launched carbon-neutral eggs, Charles asked about the new rules to combat bird flu.
Claire Anderson, commercial manager of Chippendale Foods, which supplies the “Planet Friendly” eggs to Morrisons, said the royal visitor asked whether all the birds now had to be kept indoors, which she said they did.
Charles looked intrigued by how the eggs get their carbon-neutral status, by being fed on black soldier fly larvae, which themselves feed on waste products from the supermarket operation.
Ms Anderson said he also asked whether the eggs are more expensive than normal eggs which, she said, they were slightly.
The King was shown around the HQ, where about 2,000 people work, by Morrisons chief executive David Potts.
King Charles III smiles as he speaks to members of Morrisons staff.
Russell Cheyne
King Charles III shakes hands with David Potts, chief executive of Morrisons Supermarkets.
Russell Cheyne
King Charles III meets members of staff during a visit to the head office of Morrisons in Bradford.
Russell Cheyne
King Charles III smiles during a visit to the head office of Morrisons in Bradford.
Russell Cheyne