Flavorful French Onion Soup Recipe with Perfect Gruyère Crust
A cozy and comforting French onion soup featuring slow-caramelized onions and a crispy, melty Gruyère cheese crust. Perfect for chilly evenings and easy to prepare with simple pantry staples.
- Prep Time: 15 minutes
- Cook Time: 1 hour
- Total Time: 1 hour 15 minutes
- Yield: 4 servings 1x
- Category: Soup
- Cuisine: French
Ingredients
Scale
- 4 large yellow onions, thinly sliced
- 3 tablespoons unsalted butter
- 1 tablespoon olive oil
- 2 garlic cloves, minced
- 6 cups beef broth (low-sodium preferred)
- 1/2 cup dry white wine (optional)
- 2–3 sprigs fresh thyme
- 1 bay leaf
- Salt and freshly ground black pepper, to taste
- 1 French baguette, sliced into 1/2-inch thick rounds
- 2 cups shredded Gruyère cheese
Instructions
- Slice the onions thinly using a sharp chef’s knife (about 10 minutes).
- Heat butter and olive oil over medium-low heat in a large heavy-bottomed pot. Add onions and a pinch of salt. Stir frequently and caramelize slowly until onions are golden brown and sweet, about 45 minutes to 1 hour. Reduce heat if onions start to burn.
- Add minced garlic and cook for 1 minute. Pour in white wine to deglaze the pot, scraping up browned bits. Let wine reduce by half, about 3-4 minutes.
- Add beef broth, fresh thyme sprigs, and bay leaf. Bring to a gentle simmer and cook uncovered for 20-25 minutes. Season with salt and pepper to taste.
- Preheat the oven broiler. Toast baguette slices lightly on a baking sheet.
- Ladle hot soup into oven-safe bowls. Place 2-3 toasted baguette slices on top of each bowl and pile about 1/3 cup shredded Gruyère cheese over the bread.
- Place bowls on a baking sheet and broil for 3-5 minutes until the cheese melts, bubbles, and turns golden brown and crispy. Watch carefully to avoid burning.
- Serve immediately, enjoying the crispy Gruyère crust with the rich, savory soup underneath.
Notes
Add a pinch of sugar early when caramelizing onions to speed up the process if needed. Toast baguette slices before adding to soup to prevent sogginess. Watch the broiler closely to avoid burning the cheese crust. Season broth in layers and taste before adding bread and cheese. For vegetarian version, substitute beef broth with mushroom broth and omit wine. For gluten-free, use gluten-free bread.
Nutrition
- Serving Size: 1 bowl (about 1.5 cu
- Calories: 375
- Sugar: 8
- Sodium: 600
- Fat: 18
- Saturated Fat: 10
- Carbohydrates: 30
- Fiber: 3
- Protein: 18
Keywords: French onion soup, Gruyère crust, caramelized onions, comfort food, easy soup recipe, cozy dinner