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      Part muffin, part doughnut, The "Duffin" stirs controversy

      It's part doughnut and part muffin, with a sprinkling of controversy.

      It's part doughnut and part muffin, with a sprinkling of controversy.

      Starbucks unveils a new product, the "Duffin" -- combining buttermilk, nutmeg and raspberry jam, and rolling it in sugar.

      The coffee chain says it wanted to take the muffin a step further. The only problem is, the delicacy has been concocted before -- with the same ingredients!

      Master Bea Vo, an American who took her bakery skills to London, setting up 4 cozy bakeries, says she whipped it up 2 years ago.

      The Duffin was featured in her 2011 "Tea With Bea" cookbook. Since then, she's gotten a lot of press about the delicious creation.

      Some of her customers have asked her whether Starbucks has heard of "Google."

      Starbucks is now trying to set the record straight, writing on its website that it realizes there are other Duffins out there.

      Though Starbucks' bakery supplier has trademarked the name in the United Kingdom, the chain acknowledges Bea, and says it has no plans to try to stop her from selling the specialty.

      (Information from NBC News used in this report)