Oreo took to Twitter to confirm that it's a churro-flavored creme, writing, "nice work, super-sleuths."
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In September, Oreo launched a contest asking participants to guess the flavor.
A winner has reportedly been notified and will receive $50,000.
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Oreo told People magazine that other top guesses from fans were funnel cake, graham cracker and gingerbread.
The cookie company said the new churro-flavored creme Oreo should be available nationwide.