While it is not extensively documented, there have been reports and anecdotes suggesting that some members of the British royal family enjoy cooking and occasionally prepare meals for themselves. However, it is worth noting that the royals typically have access to personal chefs and staff who handle their culinary needs and meal preparations.
For instance, it has been reported that Prince Charles, the Prince of Wales, enjoys cooking and has a keen interest in organic farming and sustainable food practices. He has been known to prepare meals using ingredients from his own gardens at Highgrove House.
Additionally, Prince William and Prince Harry have both mentioned their love for cooking in various interviews. Prince William reportedly enjoys making simple meals at home, and Prince Harry has expressed his fondness for preparing roast chicken.
However, it is important to remember that the royal family's lifestyle involves a busy schedule and often involves official engagements and responsibilities, which may limit their personal cooking endeavors. Consequently, while some members of the royal family may cook for themselves on occasion, it is likely that their culinary needs are primarily attended to by dedicated kitchen staff.