Extra Long Cheeseburger: Allergens at a Glance
The honest verdict
Extra Long Cheeseburger · Burger King
The Extra Long Cheeseburger is a Burger King menu item featuring an elongated sesame seed bun, a larger beef patty, American cheese, pickles, ketchup, and mayonnaise. The allergen profile is anchored by wheat (bun), milk (cheese), and egg (mayonnaise). Sesame is present on the bun. Soy appears in refined soybean oil used in the mayonnaise and potentially in the fryer for sides. The 'Extra Long' format is a distinct product from the classic Whopper (which adds fresh vegetables and ketchup without mayo) and the standard cheeseburger (smaller bun and patty). Cross-contact on shared grills and prep surfaces is possible. Always confirm with your specific Burger King location before ordering.
Allergen details change and vary by location. This is a general guide — always confirm with the restaurant before ordering. Not official or medical advice.
Key facts
The Extra Long Cheeseburger bun is sesame-seeded, making it a direct source of the 9th major food allergen under the FASTER Act.
FDA — Food Allergen Labeling and Consumer Protection Act (FALCPA) and FASTER Act
Mayonnaise on the Extra Long Cheeseburger contains egg, which is a primary allergen — ordering without mayo removes this risk.
Burger King's allergen menu lists wheat, milk, egg, and sesame as present in the Extra Long Cheeseburger — verify at your location.
Every major allergen, one clear grid
Each of the nine major allergens marked for Extra Long Cheeseburger at Burger King — Contains, May contain (cross-contact or varies), or Free. Anything we couldn't confirm defaults to "may contain," because a shared kitchen can't be ruled out without the restaurant's official menu.
- MilkContains
American cheese slice is a standard component of the Extra Long Cheeseburger. Milk is a primary ingredient in cheese. Removing the cheese eliminates this allergen.
- EggContains
Mayonnaise is a standard topping on the Extra Long Cheeseburger. Egg is a primary ingredient in mayonnaise. Ordering without mayo removes this allergen.
- Wheat / GlutenContains
The elongated sesame seed bun is wheat-based. This is the primary source of gluten in the burger. There is no standard gluten-free bun option at Burger King.
- SoyMay contain
Refined soybean oil is used in the mayonnaise and likely in the fryer for sides. Highly refined soy oil is FDA-exempt from allergen labeling and tolerated by most with soy allergy. Those with severe soy sensitivity should confirm the oil type used with the restaurant.
- PeanutFree
Peanut is not an ingredient in the Extra Long Cheeseburger or its components. Cross-contact is very unlikely in Burger King kitchens.
- Tree NutFree
Tree nuts are not an ingredient in the burger patty, bun, cheese, or condiments.
- FishFree
Fish is not an ingredient in the Extra Long Cheeseburger. Burger King does not typically fry fish items in the same oil as burger prep surfaces.
- ShellfishFree
Shellfish is not an ingredient in the burger or its components.
- SesameContains
The elongated bun is topped with sesame seeds. This is a direct source of sesame. Removing the bun or requesting a bun without sesame seeds would eliminate this allergen, though availability varies by location.
“May contain” means cross-contact is possible or the answer varies by location — not that the allergen is a listed ingredient. For a severe allergy, treat “may contain” the same as “contains” until the restaurant confirms otherwise.
Small changes that remove an allergen
Simple modifications that can take an allergen off your extra long cheeseburger. Always name your allergy when you order and ask staff to confirm — a modification only helps if the kitchen prepares it separately.
Order without cheese
Order without mayonnaise
Request a bun without sesame seeds or a lettuce wrap
Order without the bun entirely (lettuce wrap style)
A modification lowers exposure but doesn't erase cross-contact from shared fryers, grills, or prep surfaces. For a severe allergy, confirm the prep with a manager before you eat.
Read this before you order
Cross-contact & severe allergies
A “free of” mark on the grid above means the allergen isn't an ingredient — it doesn't mean the item was made in an allergen-free kitchen. Two things matter most:
Shared fryers & equipment
Burger King grills and prep surfaces are shared across all burger items. Trace amounts of cheese, mayo, or bun crumbs can transfer between orders. The elongated bun format does not change cross-contact dynamics compared to the Whopper or standard cheeseburger. Ask staff about dedicated prep surfaces if you have a severe allergy.
If your allergy is severe
For anaphylactic allergy to wheat, milk, egg, or sesame, confirm bun ingredients, cheese presence, and mayo usage with the specific Burger King location before ordering. The Extra Long Cheeseburger is not guaranteed safe for any of these allergens without restaurant-level confirmation. Carry your epinephrine auto-injector. If you cannot confirm preparation details, consider a plain beef patty without bun or toppings.
This guidance is general and can't account for how any single location prepares your food. The restaurant's staff and official allergen menu are the final word — when in doubt, ask, or choose something else.
❓Frequently Asked Questions
Both use a sesame seed bun and beef patty, so wheat and sesame are shared allergens. The Whopper adds tomato, lettuce, onion, and ketchup (no mayo), while the Extra Long Cheeseburger includes mayonnaise and pickles. The Whopper's cheese is optional; the Extra Long Cheeseburger comes standard with cheese. The Whopper is flame-grilled; the Extra Long Cheeseburger uses a larger patty on an elongated bun. The egg risk is higher on the Extra Long due to mayo.
Yes. The elongated sesame seed bun is wheat-based, making the burger a direct source of gluten. There is no standard gluten-free bun option at Burger King. Removing the bun entirely (ordering a lettuce wrap or patty-only) eliminates the wheat, but cross-contact on shared grills can reintroduce trace gluten. For celiac disease or wheat allergy, confirm with the restaurant whether any gluten-free alternatives are available.
Yes, you can request the Extra Long Cheeseburger without cheese. This removes the milk allergen from the American cheese slice. The burger will still contain wheat (bun), egg (mayo), and sesame (seeded bun). Inform the staff of your milk allergy so they can avoid cross-contact from cheese remnants on the grill or prep surface.
Yes. The elongated bun is topped with sesame seeds, which is a direct source of sesame allergen. The FASTER Act (2023) added sesame as the 9th major food allergen, so Burger King lists sesame on their allergen menu. Removing the bun or requesting a bun without sesame seeds eliminates this allergen, but availability varies by location. Some locations may offer a plain bun without seeds upon request.
Pickles and ketchup are standard on the Extra Long Cheeseburger. Ketchup contains tomatoes, vinegar, sugar, and spices — it is typically free of the Big-9 allergens. Pickles are cucumbers in brine and are also allergen-free. The primary allergen sources remain the bun (wheat, sesame), cheese (milk), and mayo (egg). Check any specialty sauces or modifications separately.
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Read moreFind out which foods you actually react to
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Please verify before ordering
Allergen info changes and varies by location
Recipes, suppliers, and preparation methods change often and differ between locations, so the details here can go out of date or not match your specific Burger King restaurant. Always confirm directly with the restaurant and check its official allergen menu before ordering. This page is a general research summary — it is not official information from Burger King, and it is not medical advice. If you have a food allergy, decisions about what is safe to eat should be made with the restaurant and, where relevant, your healthcare provider.