Oreo's mystery flavor revealed

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(CNN) -- The case of Oreo's mystery flavor has been solved.

Courtesy: CNN

The flavor is Fruity Pebbles cereal!

The cookies hit store shelves back in October.

Oreo held a contest to guess the flavor.

They received thousands of entries from folks hoping to crack the case.

The $50,000r grand prize will be awarded to one lucky winner next week.