Oreo took to Twitter to confirm that it's a churro-flavored creme, writing, "nice work, super-sleuths."
In September, Oreo launched a contest asking participants to guess the flavor.
A winner has reportedly been notified and will receive $50,000.
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.