Classic French Onion Soup 🧅🥣🇫🇷

A timeless French comfort dish made with deeply caramelized onions, rich beef broth, herbs, and a golden layer of melted cheese over toasted bread. Sweet, savory, and incredibly cozy.

Prep Time: 15 minutes
Cook Time: 1 hour 15 minutes
Total Time: About 1½ hours
Servings: 6

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Ingredients

Soup

• 6 large yellow onions, thinly sliced
• 3 tablespoons unsalted butter
• 1 tablespoon olive oil
• 1 teaspoon salt
• ½ teaspoon black pepper
• 1 teaspoon sugar (optional, helps caramelization)
• 3 cloves garlic, minced
• ½ cup dry white wine (optional)
• 6 cups beef broth (low-sodium preferred)
• 2 tablespoons Worcestershire sauce
• 2 teaspoons fresh thyme leaves (or 1 teaspoon dried thyme)
• 2 bay leaves
• 1 tablespoon all-purpose flour (optional, for slightly thicker soup)

Cheese Toast Topping

• 6–8 slices French baguette or sourdough bread
• 2 cups shredded Gruyère cheese
• ½ cup shredded Swiss cheese (optional)
• ¼ cup grated Parmesan cheese

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Instructions

1. Caramelize the Onions

1. Heat butter and olive oil in a large heavy-bottomed pot over medium heat.
2. Add sliced onions and salt.
3. Cook for 10 minutes, stirring occasionally, until softened.
4. Reduce heat to medium-low and continue cooking for 40–50 minutes, stirring every few minutes, until onions are deep golden brown and caramelized.
5. Add sugar (if using) during cooking to help develop color.

2. Build the Soup

1. Add garlic and cook for 30 seconds.
2. Sprinkle flour over the onions (if using) and stir for 1 minute.
3. Add white wine and scrape up any browned bits from the bottom.
4. Pour in beef broth.
5. Add Worcestershire sauce, thyme, and bay leaves.
6. Simmer uncovered for 25–30 minutes.
7. Remove bay leaves and adjust seasoning.

3. Make the Cheese Toasts

1. Toast baguette slices until lightly crisp.
2. Place soup into oven-safe bowls.
3. Top each bowl with toasted bread.
4. Sprinkle generously with Gruyère, Swiss, and Parmesan.
5. Broil for 2–4 minutes until cheese is melted, bubbly, and golden.

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Serving Suggestions

Serve with:

• Simple green salad
• Roasted vegetables
• Garlic bread
• Steak or roast beef sandwich
• A glass of dry white wine

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Variations

Slow Cooker French Onion Soup

• Cook onions with butter on LOW for 8–10 hours until caramelized.
• Add broth and seasonings, then cook another 2 hours.

Creamy French Onion Soup

• Stir in ½ cup heavy cream before serving.

Vegetarian Version

• Replace beef broth with rich vegetable broth and add mushrooms for extra depth.

Extra Cheesy

• Use a mix of Gruyère, mozzarella, and Parmesan for a stretchy topping.

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Storage

Refrigerator: Store soup (without bread and cheese topping) for up to 5 days.

Freezer: Freeze soup base for up to 3 months.

Reheat: Warm gently on the stovetop, then add fresh toasted bread and cheese before serving.

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Approximate Nutrition (Per Serving)

• Calories: 420
• Protein: 18 g
• Carbohydrates: 35 g
• Fat: 25 g
• Fiber: 4 g
• Sugar: 10 g
• Sodium: 850 mg

Chef Tips for the Best French Onion Soup

🧅 Take your time caramelizing the onions—the deep flavor comes from slow cooking.
🧀 Gruyère cheese gives the classic nutty, rich flavor and perfect melt.
🍞 Use day-old bread for a topping that holds up better in the broth.
🥣 A heavy pot like a Dutch oven helps onions brown evenly.

This Classic French Onion Soup is rich, savory, and comforting—the perfect bowl for a cozy dinner or elegant starter. 🧅✨