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French Onion Soup: 3 Amazing Tips

French Onion Soup

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A rich and comforting classic French onion soup with deeply caramelized onions, savory broth, and a bubbling, golden cheese-topped baguette slice. Perfect for cozy nights or elegant dinners.

Ingredients

Scale
  • 6 large yellow onions, thinly sliced
  • 3 tablespoons butter
  • 1 tablespoon olive oil
  • 2 cloves garlic, minced
  • 1 tablespoon all-purpose flour
  • 6 cups beef broth
  • 1/2 cup dry white wine (optional)
  • 1 bay leaf
  • 1 teaspoon dried thyme or a few fresh sprigs
  • 1 teaspoon salt (or to taste)
  • 1/2 teaspoon black pepper
  • 8 slices baguette, toasted
  • 1 1/2 cups Gruyère cheese, shredded

Instructions

  1. Preheat your oven to broil and place the oven rack in the top third.
  2. Melt butter and olive oil in a large pot or Dutch oven over medium heat. Add the thinly sliced onions and cook, stirring often, for 40–45 minutes until they are deep golden brown.
  3. Add the minced garlic and flour to the pot. Stir to coat the onions and cook for 1–2 minutes more.
  4. Deglaze the pan with white wine (if using), scraping up any browned bits from the bottom. Pour in the beef broth, add the bay leaf and thyme, and season with salt and pepper.
  5. Bring the soup to a simmer and cook uncovered for 20–25 minutes. Remove the bay leaf and thyme sprigs.
  6. Ladle the French onion soup into oven-safe bowls. Top each bowl with a slice of toasted baguette and a generous handful of shredded Gruyère cheese.
  7. Place the bowls on a baking sheet. Broil for 2–4 minutes, or until the cheese is bubbly and golden brown.
  8. Serve the classic French onion soup hot and savor each bite.

Notes

  • Use yellow onions for the best flavor balance in your homemade French onion soup.
  • Deglaze the pan well when making your caramelized onion soup to incorporate maximum flavor.
  • Gruyère cheese melts beautifully, but Swiss or Emmental are great substitutes for this French onion soup recipe.

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