French onion soup is a comforting, rich, and flavorful classic that combines caramelized onions, savory broth, and melted cheese atop crusty bread. Whether you’re making it the traditional way or using an Instant Pot, this soup is perfect for cozy dinners and impressing guests.
How to Make French Onion Soup
Learn the step-by-step process to make French onion soup, starting with slow caramelization of the onions to unlock their deep sweetness, followed by simmering with broth and finishing with broiled cheese on toasted bread.
What ingredients are used in French Onion Soup?
Classic French onion soup uses yellow onions, beef broth, butter, garlic, thyme, bay leaves, salt, pepper, and Gruyère cheese. Variations include chicken broth or vegetable broth for lighter or vegetarian options.

Best Onions for French Onion Soup
Yellow onions are preferred for their balance of sweetness and sharpness, making them ideal for caramelizing perfectly in this soup.
French Onion Soup Calories and Nutrition
French onion soup is relatively moderate in calories but rich in sodium and fat due to the cheese and broth. It can be made healthier with low-sodium broth and less cheese.
Best Cheese for French Onion Soup
Gruyère is the classic cheese for topping French onion soup because it melts beautifully and adds a nutty, savory flavor. Swiss or mozzarella can be used as alternatives.

The Secret Ingredient for French Onion Soup
Some chefs add a splash of dry white wine or sherry to enhance the depth of flavor. Others use a touch of sugar to help caramelize onions better.
Is French Onion Soup Healthy?
While flavorful, the soup can be high in sodium and fat. Opting for vegetarian or vegan versions with vegetable broth and dairy alternatives can make it healthier.
What to Eat or Serve with French Onion Soup
Pair this soup with crusty bread, a light salad, or a glass of white wine to complete your meal.
Popular French Onion Soup Recipes
French Onion Soup with Chicken
Add shredded cooked chicken to your soup for a hearty twist.

Instant Pot French Onion Soup
Speed up the caramelization and simmering process using an Instant Pot, perfect for busy nights.

Panera Bread French Onion Soup
Try recreating the famous Panera Bread version at home, known for its rich broth and crispy cheese topping.

Vegetarian French Onion Soup
Make it vegetarian by using vegetable broth and skipping any meat-based ingredients.

Vegan French Onion Soup
Use vegetable broth, vegan cheese, and olive oil or vegan butter to enjoy this classic vegan-style.

French Onion Soup Casserole
Bake French onion soup with cheese and bread in a casserole dish for a cozy meal.

Frequently Asked Questions (FAQs)
Q: How do you make French onion soup?
A: Slowly caramelize onions until golden and sweet, add broth and herbs, simmer, then top with toasted bread and melted cheese.
Q: What are the ingredients of French onion soup?
A: Yellow onions, beef or vegetable broth, butter, garlic, thyme, bay leaves, salt, pepper, and Gruyère cheese.
Q: What are the best onions for French onion soup?
A: Yellow onions are ideal due to their sweetness and flavor when caramelized.
Q: How many calories are in French onion soup?
A: It varies but generally ranges around 300-400 calories per serving, depending on cheese and broth used.
Q: What cheese is best for French onion soup?
A: Gruyère cheese is classic, but Swiss or mozzarella can also be used.
Q: What is the secret ingredient in French onion soup?
A: A splash of white wine or sherry can deepen the flavor.
Q: Is French onion soup healthy?
A: It can be enjoyed as part of a balanced diet but watch the sodium and cheese content.
Q: What to serve with French onion soup?
A: Crusty bread, salad, or a glass of white wine pair perfectly.
Related Categories:
- Soup recipes
- French recipes
- Onion soup recipes
- French onion soup recipes with chicken
- French onion soup recipes with cheese
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