Why You’ll Love This Recipe

French Onion Burgers combine the rich, savory flavor of classic French onion soup with the juicy satisfaction of a grilled burger. Topped with caramelized onions, melted Swiss or Gruyère cheese, and nestled in a toasted bun, these burgers are indulgent, comforting, and bursting with umami. Perfect for a cozy dinner or an elevated cookout, they offer a gourmet twist on a backyard favorite.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

ground beef (80/20 blend recommended)yellow onions (thinly sliced)unsalted buttersalt and pepperbeef broth (low-sodium preferred)Worcestershire sauceSwiss or Gruyère cheese slicesbrioche or hamburger bunsmayonnaise (optional)fresh thyme (optional for garnish)

directions

In a large skillet over medium heat, melt butter and add sliced onions.

Cook onions slowly, stirring often, for 25–30 minutes until deep golden and caramelized.

Add a splash of beef broth and Worcestershire sauce to the onions; simmer until thickened. Set aside.

Form the ground beef into equal-sized patties and season both sides with salt and pepper.

Grill or cook the patties over medium-high heat for 4–5 minutes per side, or until desired doneness.

During the last minute of cooking, top each patty with a slice of cheese and cover to melt.

Toast the buns cut-side down in butter on a skillet or grill until golden.

Spread mayonnaise on the bottom bun (if using), then place the burger patty on top.

Spoon a generous amount of caramelized onions over the cheese and garnish with thyme if desired.

Top with the other half of the bun and serve immediately.

Servings and timing

This recipe yields 4 burgers.Preparation time: 15 minutesCooking time: 30 minutesTotal time: 45 minutes

Variations

Add a splash of white wine while caramelizing onions for extra depth.

Swap mayonnaise for a garlic aioli or Dijon mustard.

Use turkey or plant-based patties for a lighter version.

Top with crispy fried onions for crunch.

Serve open-faced on toasted sourdough for a bistro-style twist.

storage/reheating

Store leftover patties and onions separately in airtight containers in the fridge for up to 3 days.Reheat patties and onions in a skillet over medium heat until warmed through.Reassemble fresh with toasted buns before serving.

FAQs

Can I make the onions ahead of time?

Yes, caramelized onions can be stored in the fridge for up to 5 days.

What’s the best cheese for these burgers?

Swiss or Gruyère melt beautifully and add the right nutty, savory flavor.

Can I use a different type of onion?

Yellow onions are best, but white or sweet onions also work well.

Do I need to use beef broth?

It adds depth, but you can skip or use a splash of water if needed.

Can I cook the burgers indoors?

Yes, use a cast iron skillet or grill pan for great results.

Can I freeze these?

Cooked patties freeze well; thaw and reheat before serving. Avoid freezing onions.

What sides go well with French Onion Burgers?

Try roasted potatoes, sweet potato fries, or a crisp green salad.

Is this recipe kid-friendly?

Yes, though you can scale back the onions for picky eaters.

Can I make sliders instead?

Absolutely—use smaller buns and patties and follow the same steps.

How can I keep the onions from burning?

Cook low and slow, stirring often and adding a splash of broth or water if needed.

Conclusion

French Onion Burgers are a rich, flavorful twist on the traditional burger, combining melty cheese and sweet caramelized onions for a taste that’s both comforting and elegant. Whether served at a casual family dinner or a weekend BBQ, these burgers deliver a bold, savory bite that’s sure to impress. Once you try them, they might just become your new favorite burger.