Smashburger French Onion Burger

You can make a copycat Smashburger French Onion burger at home. It is so easy to make this amazing burger at home.

Two French onion burgers on a wood board

Smashburger Burgers

Smashburger makes some of the best hamburgers that you can buy. They are flavorful, made with fresh meat, and made fresh to order. Smashburger is unique in how they prepare their burgers.

Smashburger smashes the meat into the grill while cooking. By smashing the meat onto the grill the flavor and juice get locked into the meat. Smashburger does not use ordinary ground beef for their burgers they use minced chuck steak. Using higher-quality meats means that you get a better burger.

What makes the Smashburger French Onion Burger so special

Their French onion burger is a fun new burger that they serve on their limited menu. This burger features sauteed onions, Boursin cheese, swiss cheese, and two patties all served up on a delightful onion bun. It’s not every day that you can find a burger that packs so much flavor in itself.

This isn’t your ordinary burger, it is one that is extraordinary. The combination of Boursin and Swiss cheese you send up with a burger that is going to make you want to say “oui-oui”.

Two Homemade Smashburger French Onion Burgers

If you have never purchased Boursin cheese it is a brand of cheese that combines Gournay Cheese and mouthwatering herbs and spices to create an array of delicious flavors. It is delicately wrapped in a signature foil to preserve freshness.

I have to be honest here, I love Boursin cheese. A slice of it makes an ordinary grilled chicken breast into something extraordinary. Whenever I have guests over I love to serve up some Boursin cheese, the plate of Boursin cheese always comes back empty. The creaminess of this cheese is the perfect substitution for mayonnaise or mustard on a burger.

Two French onion burgers on a wood board

Copycat Smashburger French Onion Burger

You are going to love this flavor combination of the Boursin cheese, Swiss cheese, and grilled onions on a toasted onion bun.
5 from 10 votes
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Course: Main Course
Cuisine: American
Keyword: Burger, French Onion Burger, Smashburger French Onion Burger
Prep Time: 10 minutes
Cook Time: 15 minutes
Total Time: 25 minutes
Servings: 4
Calories: 859kcal


  • 4 Onion Buns
  • 1 white onion sliced thin
  • 1 tablespoon butter
  • 2 pounds ground beef
  • 8 slices swiss cheese
  • Boursin cheese
  • 2 teaspoons kosher salt
  • 2 teaspoons ground black pepper
  • 2 teaspoons garlic salt


  • Prepare burger seasoning, and use for the recipe. In a small bowl combine the kosher salt, ground black pepper, and garlic salt. 
  • Saute onions with butter on the grill. Sprinkle burger seasoning on the onions. Cook the onions until they are tender. Do not brown the onions. 
  • Butter each of the buns and cook the buns on the grill. Cook the buns on the grill until they are lightly brown.
  •  Form 8 balls of the burger meat. Heat the grill to about 350 degrees. Place the balls on the grill. Smash burger meat onto the grill. Season with burger seasoning. 
  • Cook for 2 to 3 minutes flip and continue to cook on the other side. Place 1 slice of Swiss cheese on each burger while they are on the grill. 
  • Build the burger by building up from the bottom by adding the two burgers with cheese on each bun. Then top with grilled onions, and spread some Boursin cheese on the top bun. Top the burger with the top bun.


Calories: 859kcal | Carbohydrates: 4g | Protein: 54g | Fat: 67g | Saturated Fat: 31g | Cholesterol: 230mg | Sodium: 2675mg | Potassium: 668mg | Fiber: 0g | Sugar: 1g | Vitamin A: 655IU | Calcium: 495mg | Iron: 4.8mg

Love A great burger? Try these Smashburger Recipes and more!

Smashburger Buffalo and Blue Cheese
Smashburger Truffle Mushroom Swiss
Smashburger Smashsauce
Copycat Applebees Quesadilla Burger

About Stephanie Manley

I recreate your favorite restaurant recipes, so you can prepare these dishes at home. I help you cook dinner, and serve up dishes you know your family will love. You can find most of the ingredients for all of the recipes in your local grocery store.

Stephanie is the author of's Dining Out in the Home, and's Dining Out in the Home 2.

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Reader Interactions


  1. AdmissionBlock

    I am a HUGE burger fan! This looks like an ultimate food fantasy. Though if I had to pick one thing bad, the SIZE looks small. I would make it with a larger bun 🙂
    You have a great talent.

  2. Fotógrafo em Sorocaba

    My family make something similar with onions, but we eat it with barbecue.

    its: onions, garlic, mayo, olive oil (just if you want), salt and pepper. Mix exerything on blender… ready to go 😀

    It’s delicious!

  3. Baltisraul

    Kudos on the photo!!! That alone will tip the scales in favor of making this for Memorial Day cookout. Combine that with some smoked Baby Back’s and KFC coleslaw (with tarragon vinegar) and there will be smiles all around!!
    Thanks Steph for another home run!! Our go-to site.

      • Baltisraul

        Only made 4 burgers but I really needed 8. They were that popular. Can’t imagine what I was thinking! I have never been that good of a rib cook. My wife hinted these were the best I have ever smoked. Last hour I basted them with some peach BBQ sauce. Wonderful Decoration Day. I guess the kids now call it Memorial Day. ha ha

5 from 10 votes (2 ratings without comment)

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