Print

Classic French Onion Soup

Print Recipe

A deeply flavorful, slow-cooked onion soup with a rich broth, topped with toasted baguette slices and bubbling golden Gruyère cheese—perfect for cozy evenings and elegant dinners alike.

Ingredients

Scale
  • 5 large yellow onions, thinly sliced
  • 3 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1 tsp sugar
  • 1/2 tsp salt
  • 2 cloves garlic, minced
  • 1/2 cup dry white wine (optional)
  • 6 cups beef or vegetable broth
  • 2 tsp fresh thyme (or 1 tsp dried)
  • 1 tbsp all-purpose flour
  • Salt and black pepper to taste
  • 1 baguette, sliced into 1/2-inch rounds
  • 1 1/2 cups shredded Gruyère cheese
  • 1/4 cup grated Parmesan (optional)

Instructions

  1. In a large heavy-bottomed pot or Dutch oven, melt butter with olive oil over medium heat. Add sliced onions, sugar, and salt. Cook slowly, stirring often, for 30–40 minutes until onions are golden brown and caramelized.
  2. Add garlic and cook for 1 more minute. Stir in flour and cook for 1–2 minutes.
  3. Pour in white wine (if using) and deglaze the pot, scraping up browned bits.
  4. Add broth and thyme, bring to a simmer, and cook uncovered for 20–25 minutes. Season with salt and pepper to taste.
  5. Meanwhile, toast baguette slices until crisp.
  6. Ladle soup into oven-safe bowls. Top each with 1–2 toasted baguette slices and a generous handful of Gruyère.
  7. Broil in the oven for 2–3 minutes or until cheese is melted and bubbly. Serve hot with extra thyme if desired.

Notes

  • Caramelizing onions slowly is key to building deep flavor—don’t rush this step.
  • Vegetable broth can be used for a vegetarian version.
  • Use oven-safe bowls or ramekins for broiling the cheese topping.

Nutrition

Keywords: French onion soup, caramelized onions, Gruyère cheese, soup recipe, classic French soup

Find it online: https://epicrecipebox.com/classic-french-onion-soup/