Oreo reveals its Mystery cookie flavor — and a lot of people guessed right

It’s the question that has been weighing on the minds of Americans for two months: What exactly is the mystery flavor in the Mystery Oreo?

On Tuesday, Oreo gave us the answer, which can be summed up in one famous phrase: Yabba dabba doo!

That’s right, the mystery flavor is …

Oreo revealed that its Mystery cookie flavor is Fruity Pebbles cereal.Oreo/Facebook

Fruity Pebbles cereal!

“It was a mystery for the ages. That is, the stone ages,” Oreo declared in its announcement on Facebook. (Someone over there is a big “Flintstones” fan.)

But this reveal won’t come as a major surprise to the many Oreo lovers (including some at TODAY) who accurately predicted the flavor following the cookie's initial release.

Kathie Lee Gifford and Hoda Kotb were both on the right track when they sampled the Mystery Oreo in early October.

Kathie Lee and Hoda try mystery Oreos: Can you guess the flavor?

    “Watermelon?” Hoda guessed. “Some sort of a fruit … It’s some sort of melon,” Kathie Lee added.

    Close, but not quite.

    After debuting the Mystery flavor, Oreo also launched a sweepstakes encouraging fans to submit their own guesses online or via text message, with a $50,000 grand prize at stake. The contest ended on Nov. 30 but a winner has not been announced.

    Putting the guessing game aside for a moment, the Mystery Oreo was one of the more divisive limited-edition Oreo flavors this year. After Tuesday’s big reveal, some fans chimed in on Facebook to let Oreo know exactly how they felt about the cookie.

    “They were awful me and my dude had 1 cookie each and we both took one bite and couldn't finish it,” one person wrote.

    “Hm. I thought it was orange scented industrial cleaner. So close,” another commenter wrote.


    20 Oreo flavors you had no idea existed

    Waffles & Syrup Oreos

    This limited edition cookie is only available in Albertsons stores. The outside cookies are Golden Oreos, while the cream appears to have a dot of syrup in the center.

    Firework Oreo

    Oreo is hoping this cookie will be "fireworks" in your mouth! At the center of the cookie, blue-and-red "popping candies" (think Pop Rocks) are mixed in with the creme. 

    Dunkin Donuts Mocha Oreos

    It just makes sense: Dunkin' Donuts Mocha Oreos are coming this summer.

    Strawberry Oreo

    While the Oreo looks like a chocolate-filled cookie, twist that baby open and you'll find a dollop of artificially-flavored strawberry cream at the center.

    Milka Oreo Big Crunch Chocolate Candy Bar

    Oreo's first candy bar ever, this bar features a crunchy layer of the classic Oreo chocolate cookie that's surrounded by vanilla cream and coated in silky Milka milk chocolate.

    Oreo Swedish Fish flavor

    "Moment of truth: Oreo may have jumped the shark with the Swedish Fish flavor. It wasn't what I was hoping for so I made the rest of the TODAY team taste them too. A majority of the editors couldn't finish a full cookie, but two die-hard Swedish Fish fans were thrilled with the taste and couldn't get enough of them," TODAY Food editor Alessandra Bulow writes.

    Oreo Choco-Chip Cookies

    The first Oreo with dual-flavored wafer, this cookie has a pretty marble-like swirl of vanilla and chocolate and flecks of chocolate. Then there's the filling, which has a hint of chocolate flavor and is studded with tiny chocolate bits.

    Skinny Oreo cookies

    These cookies are about half the width of the original, though the circumference remains the same (so we're not quite in Mini Oreo territory), and they come in original, golden and mint varieties. 

    Fruity Crisp Oreos

    The cream in these sandwich cookies is combined with a fruity and colorful rice crisp.

    The Blueberry Pie Oreo

    These graham cracker sandwich cookies are filled with blueberry cream.

    Strawberry Shortcake Oreos

    "As 'The Golden Girls' taught us in the episode where Rose makes a midnight snack of Sperheoven Krispies, some treats taste much better than they smell — and that's the case for these. While the strawberry cream filling was cloying at first whiff, a bite of the full cookie was far more pleasant." —Erin Clements, Senior Pop Culture Editor

    Oreo debuts Filled Cupcake Oreos

    The Filled Cupcake Oreo is reminiscent of another beloved treat, Hostess' iconic cream-filled chocolate cupcake. Oreo's take features two of its regular cocoa wafers sandwiching chocolate frosting with a dollop of vanilla cream in the center.

    New brownie batter Oreos

     While the rest of the cookie is pretty similar, if not identical, to the original Oreo, the stuf is distinctly "brownie batter." How on earth did they manage to replicate that creamy, chocolaty and uniquely "brownie" flavor with such precision?

    Jelly Donut flavored Oreos

    Introducing the Jelly Donut Oreo, a Golden Oreo cookie with a raspberry center and custard outer ring. And the only place you’ll be able to get your hands on it is Walmart; it’s an exclusive to the store.

    The Peeps Oreo

    For this cookie, Oreo went with a pretty pink marshmallow-and-sugar-crystal Peeps filling between two vanilla cookies.

    The Cinnamon Bun Oreo

    This cookie features cinnamon-spiced frosting sandwiched between two golden cinnamon wafers.

    The Pumpkin Spice Oreo

    The makers of the classic Oreo cookie had to make sure they had that autumn-essential flavor covered. 

    The Red Velvet Oreo

    This red-tinged chocolaty cookie with a cream cheese spin on the "creme" filling got an overwhelmingly positive response at our taste test.

    The Reese's Peanut Butter Cup Oreo

    What if an Oreo and a Reese’s Peanut Butter Cup had a baby? That’s the stuff dreams are made of. And thankfully, the cookie conception of your dreams became a reality.

    The S'Mores Oreo

    The cookie portion of the Oreo is “graham flavored,” and sandwiched between are layers of chocolate and marshmallow flavored “creme” filling.

    Personally, I liked it, and I haven’t kept a box of Fruity Pebbles cereal in my house since I was a teenager. The fruity flavor complemented the chocolate wafer pretty well — not unlike the Swedish Fish Oreo, another limited-edition flavor I enjoyed but many others didn’t. But I thought it was definitely an improvement over last year’s Fruity Crisp Oreo.

    Whether you loved the Mystery Oreo or hated it, maybe we can agree that we all had a yabba-dabba-doo time trying to guess the flavor. For now, we'll just have to wait for Oreo's next creative mashup.

    Follow Shane Lou on Twitter.