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Kate Middleton recently gave rare insight into her marriage with Prince William. During a visit to the National Federation of Women’s Institutes, the Princess of Wales revealed one thing her husband gets “very fussy” about.

Keep reading to see what she had to say…

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As Prince William and Kate Middleton enjoyed sweet treats with people involved in the organization, the future king of England raved over the chocolate brownies provided at the gathering. “I know my brownies,” William said, prompting Kate to chime in, “William is very fussy about it.” The Prince of Wales fired back, “Never put nuts in a brownie.” Replied his wife, “I had to learn the hard way.”

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Despite any fussy behavior, Prince William and Kate Middleton appear to be happier than ever in their marriage. During Donald Trump‘s headline-making state visit, the couple could be seen holding hands as they made their way out of the lavish banquet thrown in the president’s honor.

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An insider claimed Prince William and Kate Middleton are experiencing changes in their relationship due to their jam-packed schedules. “There are some major shifts coming behind the scenes,” the source said. “They are really finessing what works and what doesn’t.” The insider added that when Kate took a break from her royal duties to focus on healing following her cancer battle, “They were able to step back and reassess their priorities in all aspects of their lives.”