Williams posted images of the chicken she bought to Facebook.

This is not the Colonel's secret recipe, but an Auckland woman's discovery of fly eggs in her KFC meal would certainly be a nasty surprise.

In a Facebook post, Sarah-jane Williams says she found fly eggs embedded inside the popcorn chicken she ordered from the KFC restaurant in Pukekohe, south Auckland.

Popcorn chicken is a popular KFC product made of "bite-size" pieces of fried chicken.

FACEBOOK/SARAH-JANE WILLIAMS Williams wrote a public post on a Facebook group page on Friday, saying: "I brought popcorn chicken from Pukekohe KFC today for lunch and I found [a] nice surprise in with some of it. Some fly eggs."

Williams wrote a public post on a Facebook group page on Friday, saying: "I brought popcorn chicken from Pukekohe KFC today for lunch and I found [a] nice surprise in with some of it. Some fly eggs."

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She later made a complaint on KFC's Facebook page.

KFC responded on Facebook: "We're really concerned to see this and we need to investigate this with you."

A manager at KFC's Pukekohe branch said they were aware of the claims by Williams but were not allowed to speak to media about them.

On Sunday, Williams updated with advice she had gone to the Ministry of Primary Industries and would speak to Auckland Council on Monday.

She said MPI advised her to freeze the contaminated food until it was investigated.

KFC New Zealand is a division of Restaurant Brands New Zealand.