Oklahoma Fried Onion Burgers 🍔🧅

Oklahoma Fried Onion Burgers are a classic American diner-style burger made with thinly smashed beef and a generous layer of paper-thin onions that cook directly into the patty. The result is a crispy, caramelized onion crust, juicy beef, and an incredibly flavorful burger.

Ingredients

• 1½ lbs (680 g) ground beef, preferably 80/20
• 2 large yellow onions, very thinly sliced
• 6 hamburger buns
• 6 slices American cheese
• 1½ teaspoons salt
• 1 teaspoon black pepper
• 2 tablespoons butter
• 1 tablespoon vegetable oil

Optional Toppings

• Yellow mustard
• Ketchup
• Pickles
• Shredded lettuce
• Sliced tomato

Directions

1. Slice the Onions

Peel the onions and slice them as thinly as possible.

A mandoline makes this especially easy, but a sharp knife works too.

Separate the slices into loose strands.

2. Form the Beef Balls

Divide the ground beef into 6 equal portions.

Roll each portion loosely into a ball.

Don’t pack the meat too tightly.

3. Heat the Skillet

Heat a large cast-iron skillet or heavy frying pan over medium-high heat.

Add the butter and vegetable oil.

Once hot, add a generous handful of sliced onions for each burger.

4. Smash the Burgers

Place one beef ball directly on top of each pile of onions.

Immediately use a sturdy spatula to smash the beef very thin, pressing the onions into the meat.

Season with salt and black pepper.

Cook for approximately 2–3 minutes, until the bottom is deeply browned and crispy.

5. Flip

Scrape firmly underneath each burger with the spatula so you keep the crispy onion layer attached to the beef.

Flip the patties.

Cook for another 1–2 minutes.

Place a slice of American cheese on each patty during the final minute and allow it to melt.

For food safety, cook ground beef to 160°F (71°C).

6. Toast the Buns

While the burgers cook, lightly butter the cut sides of the buns.

Place them cut-side down in the skillet and toast until golden.

7. Assemble

Spread your favorite condiments over the toasted buns.

Place the cheesy onion burger on the bottom bun.

Add pickles or other toppings if desired.

Top with the other half of the bun.

Serve immediately.

The Classic Way

For a more traditional Oklahoma-style burger, keep the toppings simple:

Beef + fried onions + American cheese + mustard + pickles.

The caramelized onions provide most of the flavor, so you don’t need a mountain of toppings.

Tips for the Best Onion Burgers

Slice onions extremely thin: Thin slices soften and caramelize quickly while becoming part of the crispy beef crust.

Use 80/20 beef: The fat helps create a juicy burger and beautifully browned edges.

Smash immediately: The beef needs to be pressed thin while the skillet is hot.

Don’t move the burger too early: Give the first side enough time to develop a deep brown crust.

Use a sturdy spatula: A thin, strong metal spatula makes scraping and flipping much easier.

Don’t overcrowd the pan: Cook in batches if necessary so the skillet stays hot.

Serving Ideas

Serve with:

• Crispy French fries
• Onion rings
• Potato wedges
• Coleslaw
• Pickles
• A cold soft drink

Thin, crispy beef, sweet caramelized onions, and melted American cheese come together in this iconic Oklahoma burger—a simple recipe with seriously big flavor.