These French Onion Soup Burgers combine juicy beef patties, buttery caramelized onions, melted Swiss or Gruyère cheese, and golden toasted buns. All the rich, savory flavors of French onion soup in an irresistible burger!

Prep time

15 minutes

Cook time

30 minutes

Servings

4 burgers

Ingredients

Ingredient checklist

0 of 121 lb (450 g) ground beef, preferably 80/204 hamburger buns, preferably brioche4 slices Swiss or Gruyère cheese2 large yellow onions, thinly sliced2 tablespoons butter1/2 cup beef broth1 tablespoon olive oil1 teaspoon Worcestershire sauce1/2 teaspoon garlic powderSalt and black pepper, to taste1 teaspoon fresh thyme leaves (optional)1 tablespoon mayonnaise or softened butter for toasting buns

Instructions

Step 1: Caramelize the onions

Melt butter with olive oil in a large skillet over medium-low heat. Add sliced onions and cook for 15–20 minutes, stirring frequently, until soft and golden brown. Reduce the heat if they brown too quickly.

Step 2: Add the French onion flavor

Pour in the beef broth and Worcestershire sauce. Add thyme if desired. Simmer for 3–5 minutes until most of the liquid evaporates and the onions become rich and glossy. Transfer the onions to a bowl.

Step 3: Shape the burger patties

Divide the beef into four equal portions and gently shape into patties slightly wider than the buns. Season both sides with salt, black pepper, and garlic powder. Avoid compressing the meat too firmly.

Step 4: Cook the burgers

Heat a skillet or grill over medium-high heat. Cook patties for about 4–5 minutes per side, depending on thickness. For food safety, ground beef should reach an internal temperature of 160°F (71°C).

Step 5: Melt the cheese

Place a slice of Swiss or Gruyère cheese on each patty during the final minute of cooking. Cover the skillet briefly to help the cheese melt.

Step 6: Toast and assemble

Spread a little butter or mayonnaise on the cut sides of the buns. Toast in a skillet until golden. Place the cheesy patties on the bottom buns, pile on the warm caramelized onions, add the tops, and serve immediately.

Nutrition information

Estimated per burger, assuming four burgers and the ingredients listed. Values vary with the beef fat content, bun size, and cheese brand.

Calories

550–700

kcal

Protein

32–40 g

Carbohydrates

35–45 g

Fat

30–42 g

Nut information and allergy notes

Nuts used in the recipe: None. The standard ingredients do not require peanuts or tree nuts.

• Dairy: Butter and Swiss or Gruyère cheese contain milk.
• Gluten: Standard burger buns usually contain wheat. Use certified gluten-free buns if needed.
• Soy and other allergens: Worcestershire sauce and packaged buns may contain or be exposed to additional allergens. Check product labels.
• Nut allergy precautions: Check bun and condiment labels for nut cross-contact warnings, especially when preparing food for someone with a severe allergy.

Tips for the best French Onion Burgers

• Be patient with the onions: Slow cooking develops their natural sweetness and deep flavor.
• Choose the right beef: An 80/20 ground beef blend makes juicy, flavorful patties.
• Don’t overwork the meat: Gently shape the patties to keep them tender.
• Use Gruyère for a classic flavor: Swiss cheese is a great, often more affordable alternative.
• Toast the buns: This helps prevent the bread from becoming soggy.
• Make it extra cheesy: Add another slice of cheese or a little extra Gruyère over the onions.

Frequently asked questions (Q&A)

Q1: Can I make French Onion Soup Burgers ahead of time?

Yes. Caramelize the onions up to three days ahead and refrigerate them in an airtight container. Cook the patties fresh for the best flavor and texture.

Q2: Can I use ground turkey instead of beef?

Yes. Ground turkey works well, although the flavor will be milder. Cook ground turkey to an internal temperature of 165°F (74°C).

Q3: Which cheese is best for these burgers?

Gruyère gives a rich, nutty flavor that resembles French onion soup. Swiss cheese melts beautifully, while provolone is another good option.

Q4: How do I caramelize onions faster?

Slice them thinly and cook over medium to medium-low heat, stirring regularly. Avoid turning the heat too high, because the onions can burn before becoming soft and sweet.

Q5: Can I cook these burgers on a grill?

Yes. Grill the patties until they reach 160°F (71°C), then melt the cheese on top. Cook the onions separately in a skillet.

Q6: How should I store leftovers?

Store the cooked patties and onions separately in airtight containers in the refrigerator for 3–4 days. Refrigerate within two hours of cooking and reheat thoroughly.

Q7: Can I freeze the burger patties?

Yes. Freeze cooked patties separately from the onions for up to 2–3 months for best quality. Thaw in the refrigerator before reheating.

Q8: What should I serve with these burgers?

French fries, roasted potatoes, green salad, coleslaw, or roasted vegetables all make excellent sides.

Q9: Can I make this recipe low-carb?

Yes. Serve the patties and onions in lettuce wraps or without the bun. Check your Worcestershire sauce and other condiments for added sugar.

Q10: Why is my burger bun getting soggy?

The onions may contain too much broth. Simmer until most of the liquid evaporates, and toast the buns before assembling.

Serving suggestion

Serve these burgers hot with crispy oven fries and a fresh green salad. For an extra French onion soup-inspired touch, spoon a little additional caramelized onion over each cheesy patty just before serving.