Like all great mysteries, this one has come to an end.

Oreo has announced the inspiration for its latest mystery flavor — and it’s not french toast, as “Stranger Things” actor Gaten Matarazzo guessed back in September.

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In an Instagram post shared Monday, the makers of "America’s favorite cookie" revealed the flavor as “churro.”

An error occurred while retrieving the Instagram post. It might have been deleted.

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The sweet, cinnamon-y cookie was released as part of the brand's mystery flavor contest on Sept. 16. Participants were encouraged to try the mystery Oreo and make a guess based on the taste, but the cookie brand also provided helpful hints on its website. Those who accurately guessed the #MysteryOREO were then entered into a sweepstakes, wherein one grand-prize-winner was chosen at random to win $50,000.

The contest ran through Nov. 10, according to the initial press release, but the flavor was only revealed Dec. 2.

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The brand confirmed that the winner had been selected and notified directly.

For those who were not chosen to receive a windfall of cash, fear not: You can still enjoy the sweet, Churro-forward flavor of Churro Oreos for a limited time nationwide. (iStock)

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For those who were not chosen to receive a windfall of cash, fear not: You can still enjoy the sweet, Churro-forward flavor of Churro Oreos for a limited time nationwide.