Fast food's oldest calling card — the boring bun — is getting turned on its head by Millennials.

Raised on breads often several culinary notches up from the familiar Wonder Bread of their Boomer parents, the target generation of the $200 billion fast-food industry is demanding — and receiving — unconventional bread options at even the biggest fast-food chains.

That may reach a new level of one-upsmanship on Monday, when Wendy's rolls out a new burger served on a brioche bun. For those who can't pronounce the word, it's BREE-osh, a light, slightly sweet French bread that's made with milk, eggs and a rich yeast dough. The fast-food joints are going bread crazy, just as casual dining did before them.

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