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White crock filled with French onion soup, on patterned placemat.
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5 from 1 vote

French Onion Soup Recipe

This classic French onion soup recipe is the ultimate comfort food on a cold day.
Prep Time10 mins
Cook Time1 hr 15 mins
Total Time1 hr 25 mins
Course: Soups
Cuisine: French
Keyword: Comfort Foods, French Onion Soup
Servings: 4 Servings
Calories: 428kcal


  • ¼ cup unsalted butter (1 stick)
  • 6 yellow onions thinly sliced
  • 6 garlic cloves minced
  • 1 teaspoon dried thyme or 3 sprigs of fresh thyme
  • 6 cups beef broth
  • 1 tablespoons balsamic vinegar
  • 1 teaspoon Dijon mustard
  • 4 slices baguette or 12 slices if using a skinny baguette
  • 1 cup grated Gruyere cheese or Emmenthal cheese


  • Melt the butter in a large saucepan over medium heat. Add the onions, garlic, and thyme and cook for about 45 minutes, stirring occasionally, until the onion are very soft and brown.
  • Add the wine and balsamic vinegar and stir until syrupy, about 3 minutes. Add the beef broth and Dijon mustard and simmer about 20 minutes.
  • Place the baguette slices on a cookie sheet and toast in a 350 degree oven for about 5 minutes.
  • Preheat the broiler. Ladle the soup into ovenproof bowls and top each with 3 baguette slices and ¼ cup cheese. Broil until the cheese is bubbling and slightly brown. Serve.


Serving: 0.25of Recipe | Calories: 428kcal | Carbohydrates: 34g | Protein: 19g | Fat: 24g | Saturated Fat: 14g | Cholesterol: 67mg | Sodium: 1670mg | Potassium: 515mg | Fiber: 4g | Sugar: 8g | Vitamin A: 667IU | Vitamin C: 14mg | Calcium: 434mg | Iron: 2mg