Pregnant Meghan, 37, cooked the delicious treat in the kitchen at Sydney's Admiralty House, the mansion home of the Governor-General of Australia, on Tuesday night following her first full day of engagements during the royal tour.
"Prince Harry was gorgeous too, a real charmer".
Mother-of-two Higgins - who also shares a 3-year-old son Samuel with partner Dan Lee - later took to Instagram to gush about her meeting with the Duchess, saying she couldn't wait to one day tell little Luna about her brush with royalty.
Samantha, who is on holiday in Ireland after a visit to the United Kingdom where she tried and failed to arrange a meeting with Meghan, said: "I would hope that - for the sake of the baby, the family, the world and my dad - that leaving him out of the statement was not intentional".
He also expressed fear he would never be able to meet Meghan's children.More news: Netflix spikes after earnings and subscribers blow past estimates (NFLX)
If the baby is born in April, it will share the same month as the Queen and Prince Louis.
Elizabeth Alexandra Mary was born on April 21, 1926 at 17 Bruton Street, London.
The royal couple are in Dubbo - a town six hours´ drive from Sydney - to unveil a new aircraft for the country´s Royal Flying Doctor Service at the local airport, enjoy a picnic with the farming community and tour a school that works with young indigenous Australians.
During his speech, it began to rain and the Duchess of Sussex smiled as she stepped in to help her husband, before he joked "it's all right, I've got my wife".
Tfw you're just not that into colonialism.More news: Ex-West Virginia player Justin Crawford faces child sex charges in Georgia
I hope my dad is included and at a proper time.
Addressing the crowd he said: "You people are the salt of the earth, hard working and as tough as they come".
During their welcome reception, Harry thanked the people of Australia for having them, cracking a few sly jokes along the way. That resilience, sense of humour and commitment to the land are what make you unique.
"You are the backbone of this country".
"I was very concerned once he started rubbing Prince Harry's face and his hair, but Prince Harry was completely gracious and was so polite and realised what was happening and (Luke's) infatuation with his beard", Luke's school principal, Anne van Dartel told the Seven Network.More news: Air Force survey's damage to Tyndall Air Force Base following Hurricane Michael