This is an Oklahoma-style smash burger: a thin 80/20 beef patty pressed hard onto a hot griddle with a pile of raw onions smashed right into the meat. The onions cook into the crust instead of sitting on top, which is what makes this different from a regular smash burger. It’s a fast weeknight cook that also scales up easily if you want burgers ready to go for several days.
The technique that matters
Two things decide whether this burger works. First, the smash itself: you need to press the ball of beef down hard and fast within the first 30 seconds of it hitting the griddle, before the proteins set. A firm, flat spatula and real downward pressure — not a gentle nudge — is what creates the craggy, lacy-edged crust that holds the onions in place. Second, the onions have to go on before you smash, not after. Laying the raw sliced onions directly on the raw beef ball means they get pressed into the patty and essentially steam-cook against the griddle surface, turning sweet and almost jammy at the edges. If you add them after smashing, they just sit on top and slide off. Get those two steps right and everything else is straightforward.
Shopping notes
- Ground beef: 80/20 is not optional here. Leaner beef won’t produce enough fat to form the crust, and the patty will be dry. Buy it fresh the day you cook if possible, or freeze in pre-portioned balls.
- Onions: Yellow onions are the standard choice — they have enough sugar to caramelize quickly on a hot griddle. White onions work. Sweet (Vidalia) onions go softer faster, which is fine. Red onions taste good but turn an odd color under heat.
- American cheese: This is the right call for melt and flavor. Processed singles from the deli counter melt more evenly than the individually wrapped grocery-shelf kind. If you genuinely can’t use American, a young mild cheddar is the closest swap — skip the egg in the mix if you’re tempted to add anything to the beef, it makes the patty mushy and dense instead of giving you that clean crust.
- Buns: Soft potato rolls or standard brioche buns hold up to the onion moisture without going soggy as fast as plain white buns do.
Storage and reheating
Cooked patties keep well in the fridge for up to 4 days in an airtight container. Stack them with a small square of parchment between each one so they don’t stick. For longer storage, freeze the cooked patties flat on a sheet tray for 1 hour, then transfer to a zip bag — they’ll keep for up to 3 months. To reheat from the fridge, a dry skillet over medium heat for about 2 minutes per side brings the crust back better than a microwave does. From frozen, thaw overnight in the fridge first, then use the same skillet method. Toast the buns fresh each time; they don’t store well once buttered and toasted. Ground beef patties must reach an internal temperature of 160°F (71°C) — use a quick-read thermometer when reheating to confirm they’re back up to safe temperature all the way through.
What can go wrong
- Onions falling off during the smash: This usually means the onion pile was too thick or unevenly distributed on the beef ball. Keep the layer thin and centered so the smash presses them in uniformly rather than pushing them off the sides.
- No crust forming: The griddle or pan wasn’t hot enough before the beef went in. Let it preheat for at least 3 minutes on medium-high. A drop of water should evaporate instantly on contact.
- Patty sticking and tearing when you flip: You flipped too early. The patty will release naturally from the surface once the crust has fully formed — usually 2 to 3 minutes. If it resists, give it another 30 seconds.
- Soggy bun by the time you eat: The onions release a lot of moisture. If you’re packing these for later in the day, store the patty and bun separately and assemble right before eating.
- Uneven cook across multiple patties: Crowding the pan drops the surface temperature fast. Cook in batches of two maximum on a standard 12-inch skillet, or use a large griddle pan if you’re making a batch for the week.
Oklahoma Smash Burger
Ingredients
- 1.5 pounds ground beef preferably 80/20 chuck for optimal fat ratio and flavor
- 2 large yellow onions thinly sliced with a mandolin for uniform caramelization
- 1 teaspoon kosher salt divided
- ½ teaspoon freshly ground black pepper
- 4 pieces burger buns butter-toasted preferred
- 4 slices American cheese or substitute with cheddar for a sharper twist
- 2 tablespoons unsalted butter softened, for toasting buns
- 1 tablespoon neutral oil such as canola or grapeseed
Instructions
- Prepare the Onions: Thinly slice the onions and sprinkle with a pinch of kosher salt. Set aside to draw moisture—this helps them caramelize more rapidly on the griddle.
- Divide the Meat: Form the ground beef into 8 loose, golf ball-sized portions without compacting them. Keep chilled until ready to cook.
- Toast the Buns: Heat a cast iron skillet or griddle over medium. Smear butter on cut sides of buns and toast until golden brown, about 1–2 minutes. Set aside.
- Preheat the Griddle: Increase heat to medium-high (approx. 450°F / 232°C). Lightly oil the surface with neutral oil. When shimmering, it's ready.
- Smash the Patties: Place 2 beef balls on the hot griddle. Immediately top each with a mound of sliced onions and smash flat using a heavy spatula or burger press. Press firmly for 10 seconds until 1/4 inch thick, with edges spreading into a crisp ring.
- Season and Cook: Sprinkle with salt and pepper. Cook undisturbed for 2–3 minutes, until deeply browned and onions are crisp and lacy at edges. Flip and add a cheese slice. Cook another 1–2 minutes until cheese melts.
- Assemble: Layer two patties on each bun base, add condiments if desired (mustard is traditional), cap with toasted bun top. Serve hot.
Notes
- For extra crispy edges, use a wide slotted spatula to press patties firmly and scrape with confidence when flipping.
- Substitute brioche buns for a richer texture, or add pickles for acidic contrast.
- If using lean ground beef, add a teaspoon of beef fat or butter to each patty for added juiciness.
Nutrition
Your questions, answered
Can I use a regular skillet instead of a flat griddle?
Yes, a heavy cast-iron skillet works well. The key is that the cooking surface gets very hot and stays hot — cast iron holds heat better than thin stainless, so it’s actually a good choice for one or two patties at a time.
How thin should I slice the onions?
Aim for about 1/8 inch — thin enough that they cook through and soften during the short cook time, but not so paper-thin that they burn before the beef is done. A mandoline makes this consistent if you’re prepping a large batch.
Can I make the beef balls ahead of time and refrigerate them?
Yes, and it actually helps. Portioning and refrigerating the beef balls up to 24 hours ahead means they go onto the griddle cold, which gives you a slightly longer window to smash before the proteins set. Keep them covered so they don’t dry out.
Do I need to season the onions separately before smashing?
No — the seasoning on the beef surface transfers to the onions during cooking. Adding salt to the onions beforehand draws out moisture too quickly and can make the smash slippery and uneven.
What internal temperature should the patty reach?
Ground beef must reach 160°F (71°C) internal temperature. Because these patties are very thin, they typically hit that temperature well before they look overdone — a quick-read thermometer confirms it faster than guessing by color alone.
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