Dunkin' Donuts said it sold 4.6 million croissant donuts since the bakery chain first introduced its version of the croissant-doughnut last month. The company called it one of the most popular limited-time items in its recent history.
Dunkin' said it will extend the Croissant Donut promotion into 2015 at participating locations throughout the country "based on popular demand."
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"The positive customer response to our Croissant Donut reflects the success of our strategies focused on providing guests a menu that offers a combination of old favorites like our Original Blend Coffee and innovative and fun new products like the Croissant Donut," the company said in a statement.

Dominique Ansel Bakery in New York first introduced its now-trademarked Cronut over a year ago. National chains, includingDunkin and Jack in the Box, followed suit with similar products with different names.
Dunkin's version of the croissant-doughnut hybrid is priced at $2.49, more than twice the price of its regular doughnuts, but half the price of Dominique Ansel's Cronut.