A Gilbert woman says she was acting out of health and safety concerns when she posted a picture on the Nextdoor app of her Egg McMuffin sporting mysterious green and black markings.
But was caused the markings? We went straight to McDonald's to ask.
"With a lot of food borne issues you can't just laugh it off, it's a serious thing," said the woman, who asked not to be identified.
She said what concerned her even more, was that's exactly what the manager at the fast food restaurant did when she took the sandwich back to the restaurant.
"He didn't seem too concerned. He just laughed and said, 'Do you want a refund?'"
ABC15 reached out to regional and corporate offices for McDonald's to find out what the green and black markings on the McMuffin could possibly be.
While they spoke with us extensively on the phone, they declined to officially comment until a full investigation could be completed.
In previous news stories depicting similar sandwich issues, McDonald's corporate officials had told us the marks were likely from overcooked eggs or from unclean grills, acknowledging the problems, but underscoring they were not a health danger.
The regional spokeswoman for the fast food company also told us anytime a customer has a problem with their food, they should always notify the restaurant manager immediately.