Mystery solved: Oreo reveals mystery flavor

Oreo has revealed its mystery flavor.  It was Fruity Pebbles cereal.

The cookie company launched a contest asking people to solve the cookie conundrum for a chance at winning $50,000. Oreo will announce the winner on or around Dec.11, according to its website. 

Many Oreo fans have expressed disappointment on social media after the reveal, because the flavor seemed too obvious. In fact, we guessed it in this article from early October.

Here are some of the best responses from Twitter: