Videos of fast-food workers bouncing their breakfast "eggs" off the counter like a rubber puck have racked up millions of views this year. The clips are dramatic, but the underlying fact isn't new: most fast food breakfast sandwiches aren't made with an egg cracked into a pan. They're made with a "folded egg" or "egg patty" — a pre-cooked, frozen blend of egg and food-science additives, shipped to stores and reheated to order. Here's what's actually inside the two most common versions, and how a real scrambled egg compares.
What is a "folded egg," really?
A folded egg is liquid egg cooked flat in large manufacturing facilities, folded into a patty or square shape, frozen, and shipped to thousands of store locations. Workers reheat the frozen patty — usually in a microwave or on a flat-top grill — and drop it into the sandwich. The process is built for one thing: making an identical egg patty in every store, every day, regardless of season or supplier.
What's actually in Dunkin's egg patty
According to Dunkin's own ingredient disclosures, the egg patty contains egg whites, egg yolks, soybean oil, and water, plus 2% or less of corn starch, salt, natural flavor, xanthan gum, cellulose gum, and citric acid (Tasting Table). A real scrambled egg has one ingredient. This has ten.
The gums aren't filler for filler's sake — they're stabilizers. Xanthan gum and cellulose gum keep the egg from weeping liquid or falling apart when it's frozen, shipped across the country, and reheated in a microwave. Without them, a pre-cooked egg patty would separate into a rubbery, watery mess by the time it hit your sandwich.
What's actually in McDonald's folded egg
McDonald's uses real cracked eggs for the round patty on an Egg McMuffin, but the folded egg used on its biscuit and McGriddles sandwiches is a different product. It's made from liquid eggs combined with milk, salt, modified food starch, and citric acid, pre-cooked and folded before being flash-frozen by suppliers (Tasting Table). Modified food starch does the same job the gums do in Dunkin's version — it holds water and keeps the texture consistent through the freeze-thaw-reheat cycle.
Are xanthan gum and cellulose gum actually harmful?
Not in the way a food-additive scare headline might suggest — but they aren't inert, either. Xanthan gum is a large carbohydrate molecule that most people can't digest on their own. A 2022 study in Nature Microbiology found that a single, largely uncultured gut bacterium in the Ruminococcaceae family is the primary organism responsible for breaking xanthan gum down in the human gut, and that this digestive capacity appears to be a relatively recent adaptation tied to how common the additive has become in the food supply (PubMed). In other words: humans didn't evolve to eat this ingredient, but a lot of us now carry gut bacteria that have adapted to it because we eat so much of it.
That's not, on its own, a reason to panic about one egg patty. But it's part of a larger pattern researchers keep flagging in ultra-processed foods generally. A 2025 analysis covered by CNN found that specific clusters of food additives — including thickening gums like xanthan and guar gum alongside emulsifiers and artificial sweeteners — were associated with a measurably higher risk of type 2 diabetes in the people who consumed the most of them.
The bigger story: the male chicks behind every egg carton
There's a part of the supply chain that has nothing to do with additives. Conventional egg-laying hens are bred from a genetic line selected purely for egg production, which means the male chicks that hatch from those same eggs can't lay and grow too slowly to be profitable for meat. As a result, roughly 300 million male chicks are culled in US hatcheries every year, typically within hours of hatching (The Humane League; ASPCA).
That's starting to change. In-ovo sexing technology can now determine a chick embryo's sex before it hatches, letting hatcheries stop male eggs from developing at all. The US began selling its first in-ovo-sexed eggs, from the NestFresh brand, in July 2025, and retailers including Whole Foods, ACME, Safeway, and H-E-B now carry them in select markets (Forbes; ASPCA). Adoption is still small — consumer awareness of the technology is under 20%, per Forbes — but it's the first real shift in nearly a century of egg farming.
Which fast food chains still use real, whole eggs
Not every chain relies on a folded patty. According to a breakdown of fast food breakfast menus, Tim Hortons cracks fresh eggs for about 99% of its breakfast sandwiches and wraps, Wendy's uses fresh cracked eggs across its entire breakfast lineup, and White Castle, Jack in the Box, and Whataburger each offer at least some sandwiches made with real cracked eggs rather than a frozen patty (Tasting Table). McDonald's splits the difference: the round Egg McMuffin patty is real, the folded egg on other sandwiches is not.
What you can do today
- Ask before you order. Some chains, including McDonald's, will swap a folded egg for a real cracked egg on request.
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- Check the chain before you go. Tim Hortons, Wendy's, and White Castle default to real eggs on more of their menu than Dunkin' or McDonald's folded-egg items.
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- Scan it with Tallow. The Tallow app breaks down ingredient lists on restaurant items and packaged eggs so you can see exactly which additives and processing methods are behind your order before you buy.
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Look for in-ovo-sexed eggs at the grocery store. Brands like NestFresh are starting to show up at major retailers if you'd rather buy eggs that didn't come from a hatchery that culls male chicks.
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A folded egg patty isn't dangerous in the way one viral clip might make it look. But it is a genuinely different product from a cracked egg — engineered with stabilizers to survive a freezer and a microwave, and sitting at the tail end of a supply chain most people never think about. Knowing what's actually on the label is the first step to deciding whether that tradeoff is one you're willing to make every morning.
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