French Onion Soup
French Onion Soup is a heartwarming classic that combines slowly caramelized yellow onions, rich beef or vegetable broth, and a golden, bubbly gruyère cheese crust atop toasted baguette slices. This easy recipe delivers deep, robust flavors with simple ingredients and comforting textures perfect for any occasion.
- Author: Lucas
- Prep Time: 15 minutes
- Cook Time: 1 hour 15 minutes
- Total Time: 1 hour 30 minutes
- Yield: 6 servings 1x
- Category: Appetizers
- Method: Baking
- Cuisine: French
- Diet: Gluten Free
Soup Base
- 6 large yellow onions, thinly sliced
- 3 tablespoons butter
- 2 cloves garlic, minced
- 1 teaspoon fresh thyme leaves (or 2 sprigs thyme)
- 1 bay leaf
- 1/2 cup dry white wine
- 6 cups beef broth (or vegetable broth for vegetarian option)
- Salt and pepper, to taste
Toppings
- 1 baguette, sliced
- 2 cups shredded gruyère cheese (or Swiss, mozzarella, or aged cheddar as alternatives)
Optional Variations
- Pinch of cayenne pepper or smoked paprika for a spicy twist
- Fresh rosemary or parsley for extra herbal flavor
- Gluten-free bread or crackers instead of baguette for gluten-free option
- Caramelize the onions: Thinly slice the yellow onions and cook slowly in butter over medium-low heat, stirring frequently. Allow the onions to develop a deep amber color without burning, which takes about 40 minutes.
- Add garlic, thyme, and bay leaf: Stir in minced garlic, fresh thyme sprigs, and a bay leaf; cook for 2 minutes until fragrant.
- Deglaze with white wine: Pour in the dry white wine and scrape up the browned bits stuck to the pot bottom. Let the wine reduce by half to concentrate the flavor.
- Add broth and simmer: Pour in beef or vegetable broth, season with salt and pepper, and bring to a gentle simmer. Cook uncovered for about 30 minutes to meld all flavors.
- Prepare toasted baguette slices: Slice the baguette and toast until golden and crisp, perfect for layering on top of the soup.
- Assemble and broil: Ladle the soup into oven-safe bowls, place toasted baguette slices on top, and generously cover with shredded gruyère cheese. Broil until the cheese melts and bubbles into a golden crust.
Notes
- Be patient when caramelizing onions to develop rich sweetness without burning.
- Use homemade broth if possible for deeper flavor.
- Fresh thyme and bay leaf are key for authentic aroma.
- Watch cheese carefully under the broiler to prevent burning.
- Serve the soup hot and fresh for best taste.
- Leftovers can be refrigerated for up to 3 days; freeze broth and onions separately without toppings for up to 3 months.
- Reheat gently on stove; add fresh toasted bread and cheese before broiling.
Nutrition
- Serving Size: 1 bowl (about 1 1/2 cups)
- Calories: 350 kcal
- Sugar: 9 g
- Sodium: 820 mg
- Fat: 18 g
- Saturated Fat: 10 g
- Unsaturated Fat: 7 g
- Trans Fat: 0.2 g
- Carbohydrates: 30 g
- Fiber: 3 g
- Protein: 15 g
- Cholesterol: 45 mg
Keywords: French Onion Soup, caramelized onions, gruyère cheese soup, classic French soup, cozy soup recipe