The Perfect French Onion Soup is the ultimate cozy bowl of comfort with rich caramelized onions, a splash of red wine for depth, and a bubbling crown of Gruyere-topped toast. Serve it alongside my Best Garlic Bread Recipe for extra dunking, and if you love soup season, my Broccoli Cheddar Soup and my Caramelized Onion Flatbread are two more cozy favorites.
French Onion Soup at a Glance
- 🕒 Total Time: 1 hour (10 min prep + 50 min cook)
- 👪 Servings: 4
- 🍝 Cuisine Type: French / Comfort Soup
- 🧂 Flavor Profile: Deeply caramelized onions, bold red wine reduction, rich beef-broth base, toasty baguette with melted Gruyère and thyme — warm, savory, and satisfying.
- 📖 Dietary Info: Contains dairy (Gruyère), eggs (potential in bread/cheese), gluten (baguette), contains beef broth (not vegetarian unless substituted) — can be adapted for vegetarian by swapping broth.
- 📦 Storage Notes: Refrigerate in an airtight container for up to 4-5 days; freezes well for up to 3 months (note: prepare fresh toasts instead of freezing them)
- ⭐ Why You’ll Love It: An elegant yet cozy one-pot meal that transforms humble onions into something extraordinary — the perfect make-ahead winter soup topped with golden, gooey cheese-crusted bread.
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Why I Love This Recipe
I’ve been a French Onion Soup lover for as long as I can remember. My mom was obsessed with it, so naturally it became one of those dishes that feels like home to me. Anytime we’d see it on a menu, she’d order it without hesitation, and now I’m exactly the same way. I’ve tasted French Onion Soup just about everywhere, from cozy cafés in Paris to neighborhood spots in LA, and I’ve developed some pretty strong opinions about what makes the best one.
For me, the perfect French Onion Soup starts with an unapologetic amount of onions... sweet, deeply caramelized, and layered with flavor. (If you’re skimping on the onions, we can’t be friends.) It needs a splash of red wine to build that rich, complex base that makes the broth so addictive. And of course, it wouldn’t be complete without a thick slice of toasted bread absolutely smothered in melted Gruyère and finished with a sprinkle of fresh thyme. It’s cozy, indulgent, and exactly what I crave the moment the weather turns crisp... a big steaming bowl, a glass of red wine, and the ultimate excuse to curl up and stay in. If it's too soupy (like the broth ratio is too much - just get right outta here!)
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If you're about to embark on the soup train for the foreseeable future like me - here are a few more of my all time favorite soups- chicken tortilla soup and ribollita, just to name two.
Ingredients & Substitutions
How to Make French Onion Soup
Step 1: Melt the butter in a large pot over medium heat.
Step 2: Add the onions, garlic, bay leaves, thyme, and salt and pepper and cook until the onions are very soft and caramelized, about 25 minutes (if you love caramelized onions check out my Caramelized Onion Potato Gratin).
Step 3: Add the wine, bring to a boil, reduce the heat and simmer until the wine has evaporated and the onions are dry, about 5 minutes.
Step 4: Discard the bay leaves and thyme sprigs. Dust the onions with flour and give them a stir. Turn the heat down to medium low so the flour doesn't burn, and cook for 10 minutes to cook out the raw flour taste.
Step 5: Next, add the beef broth, bring the soup back to a simmer, and cook for 10 minutes. Season, to taste, with salt and pepper.
Step 6: Once the soup is done, preheat the broiler. Arrange the baguette slices on a baking sheet in a single layer. Top the toasts with the Gruyère.
Step 7: Broil until bubbly and golden brown, 3 to 5 minutes.
Step 8: Ladle the soup in bowls and float the Gruyère toasts on top.
How to Store French Onion Soup
Store any leftover French Onion Soup in an airtight container in the fridge for up to 4–5 days. When you’re ready to reheat, warm it gently on the stove or in the microwave until steaming hot. I always recommend making the Gruyère toasts fresh so they stay perfectly crisp just add them on top right before serving for that classic, melty finish.
How to Freeze French Onion Soup
French Onion Soup freezes beautifully and will keep for up to 3 months. I like to portion it into individual containers so it’s easy to thaw and reheat just what you need. When you’re ready to enjoy, let it thaw in the fridge overnight, then reheat on the stove until hot. Just don’t freeze the Gruyère toasts. Make those fresh when serving for the best texture and flavor.
Tips & Tricks
- Take your time caramelizing the onions. This is the heart of the recipe. Low and slow is key, so don’t rush it. The onions should be deep golden brown, soft, and jammy. That’s where all the flavor comes from.
- Use a mix of onions. Combining yellow, sweet, and even a few red onions adds layers of flavor and a touch of natural sweetness.
- Deglaze properly. When you add the red wine, use a wooden spoon to scrape up every browned bit from the bottom of the pan. Those bits add incredible depth and richness.
- Don’t skip the wine. A splash of red wine brings richness and balance to the broth. If you prefer not to cook with alcohol, a little balsamic vinegar or extra beef stock works too.
- Choose the right cheese. Gruyère is the classic choice because it melts beautifully and has a nutty, savory flavor. If you can’t find it, Swiss or Emmental are great substitutes. If you love Gruyère, here are some other delicious recipes that feature this delicious cheese: Hasselback Scalloped Potatoes, Classic Au Gratin Potatoes, and Spinach Cheese Strata that you might want to check out.
- Use oven-safe bowls. Make sure your soup bowls can handle a quick broil so you can get that bubbly, golden cheese crust on top without any cracks.
- Toast the bread first. Lightly toasting your bread before topping it with cheese keeps it from getting soggy once it hits the soup.
- Make it ahead. The soup actually gets better as it sits, so it’s a perfect make-ahead dish. Just reheat gently and add fresh toasts before serving.
- Finish with fresh thyme. A sprinkle of thyme leaves adds brightness and ties everything together.
FAQs
Can I make French Onion Soup ahead of time?
Yes! French Onion Soup actually gets better as it sits because the flavors deepen over time. You can make it a day or two ahead and store it in the fridge. When ready to serve, reheat gently on the stove and add fresh Gruyère toasts right before serving.
What kind of onions are best for French Onion Soup?
Yellow onions are classic, but a mix of yellow, sweet, and red onions adds extra flavor and complexity. Avoid using only white onions, as they can be too sharp.
Do I have to use wine in this French Onion Soup recipe?
No, but it adds amazing depth and richness. If you prefer to skip it, you can replace the wine with extra beef broth and a splash of balsamic vinegar for a similar flavor boost.
What’s the best cheese for French Onion Soup?
Gruyère is the gold standard because it melts beautifully and has a nutty flavor that complements the caramelized onions. Swiss, Comté, or Emmental are excellent backups.
What should I serve with French Onion Soup?
It’s hearty enough to enjoy on its own, but it also pairs beautifully with a simple green salad, roasted vegetables, or a glass of red wine for the ultimate cozy meal.
If you tried this recipe, please leave a 🌟 star rating and let me know how it goes in the 📝 comments below. Thanks for visiting today
French Onion Soup
Ingredients
- ¼ cup unsalted butter
- 5 yellow onions thinly sliced
- 4 cloves garlic finely chopped
- 2 bay leaves
- 3-4 fresh thyme sprigs
- Kosher salt and freshly ground black pepper
- 1 cup red wine
- 3 tablespoons all-purpose flour
- 2 quarts beef broth
- 1 baguette sliced
- ½ pound grated Gruyère
Instructions
- Melt the butter in a large pot over medium heat. Add the onions, garlic, bay leaves, thyme, and salt and pepper and cook until the onions are very soft and caramelized, about 25 minutes.
- Add the wine, bring to a boil, reduce the heat and simmer until the wine has evaporated and the onions are dry, about 5 minutes. Discard the bay leaves and thyme sprigs.
- Dust the onions with flour and give them a stir. Turn the heat down to medium low so the flour doesn't burn, and cook for 10 minutes to cook out the raw flour taste.
- Next, add the beef broth, bring the soup back to a simmer, and cook for 10 minutes. Season, to taste, with salt and pepper.
- Once the soup is done, preheat the broiler. Arrange the baguette slices on a baking sheet in a single layer. Top the toasts with the Gruyère and broil until bubbly and golden brown, 3 to 5 minutes.
- Ladle the soup in bowls and float the Gruyère toasts on top.
Notes
- Take your time caramelizing the onions. This is the heart of the recipe. Low and slow is key, so don’t rush it. The onions should be deep golden brown, soft, and jammy. That’s where all the flavor comes from.
- Use a mix of onions. Combining yellow, sweet, and even a few red onions adds layers of flavor and a touch of natural sweetness.
- Deglaze properly. When you add the red wine, use a wooden spoon to scrape up every browned bit from the bottom of the pan. Those bits add incredible depth and richness.
- Don’t skip the wine. A splash of red wine brings richness and balance to the broth. If you prefer not to cook with alcohol, a little balsamic vinegar or extra beef stock works too.
- Choose the right cheese. Gruyère is the classic choice because it melts beautifully and has a nutty, savory flavor. If you can’t find it, Swiss or Emmental are great substitutes.
- Use oven-safe bowls. Make sure your soup bowls can handle a quick broil so you can get that bubbly, golden cheese crust on top without any cracks.
- Toast the bread first. Lightly toasting your bread before topping it with cheese keeps it from getting soggy once it hits the soup.
- Make it ahead. The soup actually gets better as it sits, so it’s a perfect make-ahead dish. Just reheat gently and add fresh toasts before serving.
- Finish with fresh thyme. A sprinkle of thyme leaves adds brightness and ties everything together.
First of all, I’m obsessed w all your recipes. Like I literally make at least one a day (shoutout to your avo cucumber salad!), so I’m sure I did something wrong with this one. But I followed the recipe exactly (though I caramelized my onions extra bc at 25 mins they were still just translucent) and I had the same issue I always do: once I add the organic beef broth and simmer it down it’s still just kind of bland. The onions were bomb, and obviously anything w bread and cheese tastes yummy but my broth is just a little meh. I used the TJs organic beef broth. Do you have a brand you like??
what kind of skillet are you using?? is it something that conducts heat really well? you want the onions to be dark brown and jammy before adding the broth
What can you put instead of beef broth for vegetarians?
veggie broth! no prob
What brand of wine did
You use please? Yummy
cant remember the brand - but I cook with cab sauv
The soup looks divine! I can't wait for it to get cold here in the south. I've got to ask about those bowls though. Where are they from? I love copper.
they were from williams sonoma but they dont have them anymore!
If we don't have wine and beef broth wht can we substitute please
broth - you could use chicken stock! Unfortunately wine is a pretty key part of this recipe to give it the depth of flavor so there isn't a great substitute, but you could leave it out and just replace with the stock
delicious!!!
Well Gaby, your followers seem to have said it all! This recipe sounds easy enough and I know the taste will match the beyond amazing photos you’ve posted! Thanks also for answering questions, ie. your wine preference, etc. so excited to create this one!!
My absolute favorite soup! You can be assured this one will be made very soon.
This recipe is on the menu for this week! Do you recommend a nonstick pot or a cast iron dutch oven? Thanks so much!!
I bought all the ingredients but forgot the fresh thyme! Would you recommend using dried (if so how much) or just omit? Thanks so much! Can't wait for dinner:)
use 1/2 teaspoon of dried!! xx
I just love French Onion soup. You make it sound easy enough for me to give it a whirl!!
Is there a certain kind of red wine you recommend using?
I prefer a cabernet!
I love French onion soup. Your soup looks amazing. Will be making this after the holidays.
I made this last night. Great recipe! Directions were perfect, no need to tweak anything. Rich and delicious soup.
There is a restaurant in Seattle that my husband and I go to JUST for the french onion soup! So I am bound and determined to learn to make it at least half as well as they do. Your recipe looks visibly the most similar!! I am excited to give it a go! Any wine recommendations for this one? Thank you!!
Which restaurant do you go to? I'm new to the city and would love a recommendation for great french onion soup!