I’m not disagreeing with the trust of your comment, but despite popular belief, McDonalds does use real eggs.[1,2] Though there’s no doubt that an egg from a chicken who has walked around, eating bits of grass and bugs, will taste better and have a better nutritional profile.
[1] https://yourquestions.mcdonalds.ca/answer/does-your-egg-mcmu... [2] https://www.cnbc.com/2015/01/27/are-mcdonalds-eggs-real-fast...