Step 1: Caramelize the Onions

• Heat the butter and olive oil in a large soup pot over medium heat.
• Add the sliced onions and stir to coat them in the butter.
• Cook slowly for 35–45 minutes, stirring every few minutes.
• Once the onions soften, add the sugar if using.
• Continue cooking until the onions are a deep golden brown and caramelized.

Tip: Don’t rush this step—the rich flavor comes from slowly caramelizing the onions.

Step 2: Add Garlic and Flour

• Stir in the minced garlic.
• Cook for 1 minute until fragrant.
• Sprinkle the flour over the onions and stir continuously for another minute.

This helps give the soup a silky texture.

Step 3: Deglaze the Pot

• Pour in the white wine.
• Stir well, scraping up any browned bits from the bottom of the pot.
• Let the wine simmer for about 3–4 minutes.

If you’re not using wine, simply skip this step and add a little extra broth instead.

Step 4: Simmer the Soup

• Add the beef broth.
• Stir in the Worcestershire sauce.
• Add the thyme and bay leaf.
• Bring the soup to a gentle boil.

Reduce the heat and let it simmer for 25–30 minutes.

Taste and season with salt and black pepper.

Remove the thyme sprigs and bay leaf before serving.

Step 5: Toast the Bread

• Preheat the oven to 400°F (200°C).
• Arrange the baguette slices on a baking sheet.
• Toast for 5–7 minutes, turning once, until lightly crisp.

Step 6: Assemble the Soup

• Ladle the hot soup into oven-safe bowls.
• Place one or two toasted baguette slices on top.
• Sprinkle generously with the grated Gruyère cheese.

Step 7: Broil

• Place the bowls on a baking tray.
• Broil for 2–4 minutes, or until the cheese is melted, bubbly, and lightly golden.

Watch carefully to prevent burning.

Step 8: Serve

• Let the soup cool for 2–3 minutes.
• Garnish with chopped parsley if desired.
• Serve immediately while the cheese is hot and gooey.

Tips for the Best French Onion Soup

• Yellow onions provide the best balance of sweetness and flavor.
• Caramelize the onions slowly for the richest taste.
• Gruyère cheese is traditional, but Swiss, Emmental, or mozzarella also work well.
• Use a high-quality beef broth for the most flavorful soup.
• For a vegetarian version, substitute vegetable broth for the beef broth.

Serving Suggestions

French Onion Soup pairs wonderfully with:

• A fresh green salad
• Garlic bread
• Roasted vegetables
• Grilled steak or roast chicken
• A glass of dry white wine

Prep Time: 15 minutes
Cook Time: 1 hour 15 minutes
Total Time: 1 hour 30 minutes
Servings: 6

Rich, savory, and topped with bubbling melted cheese, this Traditional French Onion Soup is the perfect comfort food for chilly evenings or whenever you’re craving a warm, satisfying meal.