French Onion Soup is a rich, comforting soup made with slow-cooked caramelized onions in a savory broth, topped with toasted bread and melted cheese. It’s warm, flavorful, and deeply satisfying.
👥 Serves
4 people
⏱️ Prep Time
10 minutes
🕒 Cook Time
50–60 minutes
⏱️ Total Time
1 hour 10 minutes
🍳 Equipment
- Large pot or deep pan
- Wooden spoon
- Oven-safe soup bowls
- Baking tray
- Oven or broiler
🥣 Ingredients
- 4 large onions (thinly sliced)
- 2 tbsp butter
- 1 tbsp olive oil
- 3 cloves garlic (minced)
- 1 tsp sugar (helps caramelization)
- 1 tsp salt
- ½ tsp black pepper
- 1 tbsp flour (optional, for thickness)
- 1 liter beef broth (or vegetable broth)
- ½ cup white wine (optional)
- 1 tsp thyme (dried or fresh)
- 4 slices baguette or bread
- 1½ cups grated Gruyère or mozzarella cheese
📝 Ingredient Notes
- Slow-cooked onions create deep sweetness
- Beef broth gives classic rich flavor
- Gruyère cheese is traditional, but mozzarella works
- Don’t rush caramelization—it builds flavor
👨🍳 Instructions
1. Caramelize Onions
- Heat butter and oil in a pot
- Add sliced onions, salt, and sugar
- Cook on low heat for 30–40 minutes until golden brown
2. Add Flavor
- Add garlic and cook 1 minute
- Stir in flour (optional)
- Pour in white wine and let it reduce
3. Add Broth
- Add beef broth and thyme
- Simmer for 15–20 minutes
4. Prepare Bread
- Toast bread slices until crispy
5. Assemble
- Pour soup into oven-safe bowls
- Place toast on top
- Add generous cheese layer
6. Broil
- Place in oven and broil until cheese melts and turns golden
📊 Nutrition Facts (approx per serving)
- Calories: 320 kcal
- Protein: 12g
- Fat: 14g
- Carbohydrates: 30g
- Fiber: 3g
- Sodium: 850mg
💡 Tips
- Cook onions slowly for best sweetness
- Don’t burn onions—low heat is key
- Use strong broth for deeper flavor
- Serve immediately for best texture
🔄 Variations
🧄 Garlic French Onion Soup
- Add extra garlic for stronger flavor
🧀 Extra Cheesy Version
- Mix multiple cheeses
🍷 Wine-Free Version
- Replace wine with extra broth
🥗 Light Version
- Use less cheese and low-sodium broth
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