Wendy's launch this summer of the limited-time Pretzel Bacon Cheeseburger seemed to light the match that sparked the hot new trend of pretzel breads, which has since spread to chains including Blimpie, Sonic and Dunkin' Donuts. Waffles are also popping up on the popular list, with offerings ranging from the familiar waffle cone at Wendy's to the Waffle Taco breakfast sandwich at Taco Bell.

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