My favorite homemade French onion soup recipe that’s easy to make and full of the richest caramelized onion flavors.
Who’s ready for a cozy bowl of homemade French onion soup? ♡
We actually just arrived home late last night from spending a week in Provence with our parents. And amidst the most delicious week of meals together around the table in our little cottage — with fresh croissants and baguettes picked up from the local bakery, farmers market wild mushrooms and artichokes the size of your head, approximately one million French cheeses, herby olives, fresh raspberry tart, plus the loveliest crisp local rosés — I also channeled my inner Julia Child and simmered up a batch of my favorite French onion soup for dinner one evening. And it was delightful.
I actually first shared this recipe here during my very first year of blogging — now ten years ago! — and have made it countless times since. And it’s always, always a winner. Nowadays, I tend to make it vegetarian (using veggie broth instead of traditional beef broth) so that both my husband and I can enjoy it. And after living in Barcelona for a few years, we’ve also come to love the Spanish twist on this recipe as well, which includes cracking an egg into each soup bowl and then broiling it (with or without cheesy toast) until the egg is perfectly poached on top of the soup.
However its made, French onion soup is a classic and will forever remain one of my all-time favorite comfort foods. So if you’re looking for a well-tested recipe to add to your repertoire, I can vouch that this one’s a keeper!
Easy French Onion Soup Recipe | 1-Minute Video
French Onion Soup Ingredients:
The good news is that classic French onion soup only requires a few simple ingredients. You will need:
Onions: You can use white, yellow or red onions for French onion soup. But to make it the classic way, you will need 5-6 large yellow onions, peeled and thinly sliced.
Butter: The tastiest (French) way to caramelize those onions. Although feel free to use vegan butter (or just olive oil) if you are avoiding dairy.
Flour: To help thicken the soup. I typically use all-purpose, but you’re welcome to use a gluten-free flour blend. Or just omit the flour if you don’t mind having a thinner soup broth.
White wine: To help deglaze the pan. If the onions start to burn a bit on the bottom of the pan while they are caramelizing, feel free to add in an extra few splashes of wine along the way to help lift up those browned bits.
Beef stock: The classic base for French onion soup, although we often sub in veggie stock in our house to make this soup vegetarian.
Worcestershire, garlic, bay leaf, fresh thyme, salt and pepper: For seasoning. Feel free to tinker around with the amounts of each. And if you don’t have fresh thyme on hand, you’re welcome to sub in dried thyme (or some herbs de Provence).
Bread and cheese: For the cheesy toasts on top. Feel free to use whatever kind of bread (I recommend a crusty baguette) and shredded or sliced cheese (Gruyere, Asagio, Swiss, Gouda, Mozzarella, etc) that you prefer.
Full ingredients/instructions listed in the recipe below.
How To Caramelize Onions:
The first step to making traditional French onion soup is to transform that big pile of raw onions into the decadent, sweet, and irresistibly caramelized onions that will form the rich base of this recipe. Caramelization is actually a really simple process, but it does take some time. So turn some music on, maybe pour yourself an extra glass of that white wine we will be using, and get ready to spend some quality time by the stove as we work some onion magic.
To make the caramelized onions, simply melt the butter in a large stockpot over medium heat. Add your onions, and toss so that they are coated in the butter. Let them cook for about 5 minutes, until they start to turn a bit golden on the bottom, and then give them a stir. Repeat for another 5 more minutes, then give them another good stir. Then continue this rhythm — stirring the onions every 3-5 minutes or so initially, then every 1-2 minutes near the end — until the onions have caramelized into a rich chestnut brown color. (Anytime the onions look like they are starting to burn on the bottom of the pan, just add in a splash of wine or water and use a wooden spoon to scrape up those browned bits on the bottom of the pan.) Then stir in a half cup of wine to fully deglaze the bottom of the pan once the onions are ready to go.
How To Make French Onion Soup:
Once your onions are caramelized and ready to go, simply:
Add the remaining ingredients. Stir the stock, Worcestershire, bay leaf and thyme together in a large stockpot, then let the soup continue to cook until it reaches a simmer. Reduce heat and simmer for at least 10 minutes. Then remove the thyme sprigs and bay leaf, give the soup a taste, and season as needed with S&P.
Toast the bread. While the soup is simmering, go ahead and prep your toppings as well. If you’re going the traditional route with a slice of bread, toast it in the oven or in a toaster until it is nice and golden.
Broil. Place your oven-safe bowls on a thick baking sheet. Then once the soup is ready to go, ladle the soup into each bowl, top with the toasted bread and your desired amount of cheese. Place the baking sheet on an oven rack about 6 inches from the heat and broil for 2-4 minutes until the cheese is melted and bubbly, keeping a close eye on the cheese so that it doesn’t burn.
And…serve! While the cheese is freshly-melted and the soup is hot and bubbly. Yum.
There are all sorts of tweaks, shortcuts and additions that you are welcome to use to customize your own French onion soup recipe. For example, feel free to:
Skip the broiling step. If you don’t happen to have oven-safe bowls for this recipe, or if you would just prefer to skip the broiling part of the recipe all together, feel free to just top your soup with the hot slices of toast and then sprinkle the cheese on top. (Or you can bake up cheesy toasts in the oven, and then add them to your soup.)
Use croutons. In lieu of toasting slices of bread, you could also save time by using store-bought or homemade croutons.
Use dried herbs. If you don’t have fresh thyme on hand, feel free to substitute a teaspoon of dried thyme instead. Or I also sometimes like to use herbs de Provence instead for extra flavor.
My all-time favorite French Onion Soup recipe — surprisingly easy to make, and full of the best flavor.
4 pounds yellow onions, peeled and thinly sliced (approximately 5–6 large onions)
3 tablespoons butter
4 cloves garlic, minced
3 tablespoons flour
1/2 cup dry white wine
6 cups of beef stock (or veggie stock)
1 teaspoon Worcestershire sauce
1 bay leaf
3 sprigs fresh thyme (or 1 teaspoon dried thyme)
fine sea salt and freshly-cracked black pepper, to taste
grated or sliced cheese (such as Gruyere, Asiago, Swiss, Gouda or Mozzarella)
Caramelize the onions. In a large heavy-bottomed stockpot, melt the butter over medium-high heat. Add the onions and sauté until well for about 30 minutes until caramelized (but not burnt), initially stirring every 3-5 minutes, then about once a minute near the end of caramelization to prevent burning*. Add garlic and sauté for 2 minutes. Stir in the flour and cook for an additional 1 minute. Stir in the wine to deglaze the pan, using a wooden spoon to scrape up any browned bits on the bottom of the pan.
Simmer the soup. Add the stock, Worcestershire, bay leaf, and thyme and stir to combine. Continue to cook until the soup reaches a simmer. Then reduce heat to medium-low, cover and simmer for at least 10 minutes. Discard the bay leaf and sprigs of thyme. Taste the soup and season with salt and pepper as needed.
Toast the bread. Preheat oven to 400°F. While the soup is simmering, slice the baguette into 1-inch thick pieces and arrange them in single layer on baking sheet. Bake for 6-8 minutes, until the bread is toasted and golden around the edges. Remove and set aside.
Broil the topping. Switch the oven to the broiler. Once the soup is ready to serve, place your oven-safe bowls on a thick baking sheet. Ladle the soup into each bowl, then top with a baguette slice and your desired amount of cheese (I used about 1/4 cup shredded cheese for each). Place on an oven rack about 6 inches from the heat and broil for 2-4 minutes, or until the cheese is melted and bubbly. (Keep a close eye on them so that they do not burn.) Remove from the oven and serve immediately while the soup is hot and bubbly.
Absolutely delicious, thank you for the wonderful recipe. I will definitely make it again as it was a real hit with my guests.😋
Fantastic recipe! Thank you
Any tips on how to go at this recipe using your slow cooker caramelized onions? Just go to step 2 and miss out on all the yummy, garlic and wine yumminess?
Thanks for your help
Haven’t tried it yet. When does the flour come in for thickening? Thank you!