Sometimes it is just an egg. Other times it has 15 ingredients.
https://www.msn.com/en-us/foodanddrink/restaurantsandnews/whats-actually-in-fast-food-eggs/ar-AABK5BD?li=BBnb7Kz&ocid=mailsignout
McDonald’s
McDonald's McMuffins have genuine eggs, freshly cracked from the shell
and cooked for your breakfast sandwich. But if you order a Sausage, Egg,
& Cheese Biscuit, for example, the egg is a different story. Those
breakfast sandwiches and biscuits are served with a “Folded Egg,” and it
has quite a few ingredients.
Folded Egg—Pasteurized whole eggs, food starch-modified, soybean oil,
natural flavors (botanical source), sodium acid pyrophosphate,
carrageenan, flavor enhancer [salt, maltodextrin, natural flavor (plant
source), spices, herb, turmeric (color)], monosodium phosphate, citric
acid, soy lecithin (release agent).
That’s 15 ingredients in “eggs.”
Subway
Subway’s Bacon, Egg & Cheese flatbread, as well as three similar
options, offers up a scrambled egg-style patty with 15 ingredients, tied
with the McDonald’s offering.
Egg Omelet Patty—Liquid whole egg, liquid egg white, water, skim milk
powder, canola oil, butter flavour (liquid and hydrogenated soybean oil,
salt, soy lecithin, natural flavor, tocopherols), natural corn starch,
salt, xanthan gum, citric acid, white pepper.
Want it with an egg white patty instead? That list is a bit shorter.
Egg (White) Omelet Patty—Liquid egg white, natural corn starch, butter
flavour (soybean oil, natural flavour), salt, xanthan gum, white pepper.