It's a pastry called a "Duffin," a doughnut-muffin hybrid stuffed with raspberry jam and melted better.
Starbucks UK just started selling the pastries but now, a small London café chain claims it's been serving the sweet treats for the past two years.
Since Starbucks has trademarked the Duffin name, the café is worried it might have to stop selling the pastries.
Twitter users are voicing their outrage online using #DuffinGate, which is now trending.
