This French Onion Smash Burger on the Blackstone features juicy beef, caramelized onions, melty Gruyère, and buttery brioche buns for the ultimate gourmet burger at home.
If you’re looking for the ultimate gourmet burger to make at home, this French Onion Smash Burger on the Blackstone is it! Juicy beef patties, melty Gruyère cheese, and sweet, jammy caramelized onions come together on a buttery brioche bun for a restaurant-worthy burger you can make in your backyard. Whether you’re hosting friends or just craving something indulgent, this Blackstone burger recipe will wow every time.
Why You’ll Love This Recipe
- Smash burger meets French onion soup – all the rich, caramelized flavors in handheld form.
- Perfect for the griddle – cooking on the Blackstone gives the burgers an unbeatable crust.
- Make-ahead friendly – caramelized onions can be prepped in advance.
Ingredients You’ll Need
For the Burgers
- Ground Beef: Juicy and flavorful. Opt for 80/20 for the best smash burger crust.
- Seasonings: salt, onion powder, garlic powder, paprika, pepper. A simple spice blend that enhances the natural beef flavor.
- Gruyère Cheese: Melts beautifully with a nutty, creamy flavor. Substitute Swiss or provolone if needed.
- Brioche Buns: Buttery and soft, they toast up perfectly on the griddle.
For the French Onions
- Onions: The star of the show—slow-cooked until caramelized and jammy.
- Butter: Adds richness and helps the onions caramelize.
- Salt & Pepper: Balances and enhances the flavor.
- Garlic: Adds depth and savoriness.
- Balsamic Vinegar: A touch of sweetness and tang.
- Worcestershire Sauce: Boosts umami flavor.
- Wine or Beef Broth: Deglazes the griddle and adds depth. Use red or white wine, I use whatever I plan to drink along side it.
- Fresh Thyme: A fragrant, herby note.
How to Make a French Onion Smash Burger on the Blackstone
Make the French Onions
- Preheat your Blackstone griddle to medium-low heat.
- Add butter, onions, salt, and pepper. Cook slowly for about 20 minutes, stirring frequently, until the onions are soft, jammy, and deeply caramelized. Lower heat if they start to burn.
- Stir in garlic, thyme, balsamic vinegar, Worcestershire sauce, and wine (or broth). Let it bubble and reduce for about 30 seconds. Remove from griddle and set aside.
Smash the Burgers
- Mix seasonings (salt, onion powder, garlic powder, paprika, pepper) in a small bowl.
- Divide ground beef into 4 patties and season both sides.
- Cook patties on the griddle for 4–5 minutes per side, smashing slightly for crispy edges.
- Add cheese slices on top of each patty and let them melt.
- Toast brioche buns on the griddle until golden brown.
Assemble Your Burgers
- Spread mayo on the bottom bun.
- Add the cheesy burger patty.
- Pile on those caramelized French onions.
- Top with the other bun and serve hot!
Recipe Notes
- Make-ahead onions: Save time by caramelizing onions a day or two in advance and reheating before serving.
- Customize your cheese: Gruyère is traditional, but Swiss, Havarti, or provolone all work great.
- Double the batch: These burgers disappear fast, so make extras!
Serving Suggestions
Pair your French Onion Smash Burger with:
- Crispy French fries or sweet potato fries
- A simple green salad for balance
- A cold beer or glass of red wine to complement the rich flavors
Final Thoughts
This French Onion Smash Burger on the Blackstone is truly next-level. It takes everything you love about French onion soup—the sweet caramelized onions, the melty cheese, the rich flavors—and layers it onto a juicy, crusty smash burger. It’s comfort food at its finest, and once you make it, you’ll crave it again and again.
👉 If you loved this recipe, don’t forget to leave a review below and let me know how it turned out! And for more Blackstone recipes and behind-the-scenes cooking tips, make sure to follow me on Instagram @thefarmstyle where I share new ideas every week.
French Onion Smash Burger on the Blackstone
This French Onion Smash Burger on the Blackstone features juicy beef, caramelized onions, melty Gruyère, and buttery brioche buns for the ultimate gourmet burger at home.
Equipment
Ingredients
For the Burgers
- 1 lb ground beef
- 1/2 tsp salt
- 1/2 tsp onion powder
- 1/2 tsp garlic powder
- 1/2 tsp paprika
- 1/2 tsp pepper
- 4 slices gruyere cheese
- 4 brioche burger buns
For the French Onions
- 2 onions thinly sliced
- 2 tbsp butter
- 1/2 tsp salt
- 1/4 tsp pepper
- 2 cloves garlic minced
- 1 tbsp balsamic vinegar
- 1 tbsp Worcestershire sauce
- 1/4 cup wine or beef broth
- 1-2 sprigs fresh thyme
Instructions
Make the French Onions
- Preheat your griddle to medium low heat.
- Add butter, onions, salt and pepper. Allow them to cook down and deeply caramelize for about 20 minutes, stirring frequently, until the onions become very dark, soft and jammy. If the onions start to burn turn down the heat.
- Add in the garlic, thyme, wine or broth, Worcestershire, balsamic, and allow it to bubble up and reduce for about 30 seconds. Remove mixture from the griddle and set aside.
- NOTE: the French onions can be made ahead of time. Simply reheat them before assembling your burger.
Make the Burgers
- In a small bowl combine the salt, onion powder, garlic powder, paprika, and pepper. Set aside for later.
- Divide the ground beef into 4 patties.
- Season patties on both sides with the seasoning mixture.
- Add patties to the griddle and cook for 4-5 minutes before flipping and cooking an additional 4-5 minutes.
- Add your slices of cheese and allow them to get nice and melty before removing from the griddle.
- During the last few minutes add the burger buns to the griddle and allow them to get nice and golden brown. Be careful because the extra butter in the brioche buns cause them to brown quickly.
- Assemble your burger with a bottom bun, mayonnaise, burger patty, French onions, and top bun. Enjoy!
Nutrition
Calories: 621kcal | Carbohydrates: 30g | Protein: 33g | Fat: 39g | Saturated Fat: 18g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 15g | Trans Fat: 2g | Cholesterol: 126mg | Sodium: 1175mg | Potassium: 540mg | Fiber: 2g | Sugar: 7g | Vitamin A: 571IU | Vitamin C: 6mg | Calcium: 393mg | Iron: 4mg
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