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This French onion soup for one is rich, flavorful, and perfectly portioned. Sweet caramelized onions simmer in a savory broth, then it’s topped with a slice of toasted French bread and melted Gruyère cheese for a classic, comforting finish.
Featured Comment
“This is fabulous! The recipe takes right steps and time to develop flavors and it really shows in the final dish.”
– Flynn
Why You’ll Love This Recipe
- Simple Ingredients: Made with one onion and a few basic pantry staples.
- Rich and Comforting: Caramelized onions, savory broth, and melted Gruyère in every bite.
- Bistro Flavor at Home: Enjoy classic French onion soup without the restaurant price.
- Easily Doubles: Make two servings by doubling the ingredients.
What I love about this French Onion Soup for one is how it turns the simplest ingredients into a rich, satisfying bowl. Slowly caramelized onions simmer in a flavorful broth, then the soup is topped with toasted bread and melted cheese.
It’s the kind of meal that feels comforting and a little indulgent, without being complicated or time-consuming. When I want something warm and flavorful that feels like a treat, this is the recipe I turn to.
Pair your French onion soup with a crisp brussels sprouts salad, baked chicken thighs, or crustless quiche lorraine. For dessert, add a mini lemon cake. Want more soups? Browse our full collection of single serving soup recipes?
Ingredients
If you have any ingredients leftover from this small batch French Onion Soup recipe, check out our Leftover Ingredients Recipe Finder
- Butter: Adds richness and is used to sauté the onions.
- Onion: Use a small yellow onion, thinly sliced for even caramelization and natural sweetness.
- Garlic: One clove adds subtle depth without overpowering the soup.
- Seasonings: A mix of dried thyme, salt, and black pepper balances and enhances the flavor.
- Red Wine: Deglazes the pan and adds depth. You can substitute with chicken or beef broth if preferred. Leftover wine? Use it in coq au vin for one, beef stew for one, or red wine sangria.
- Flour: Slightly thickens the soup. Use a gluten-free flour blend if needed.
- Broth: I prefer chicken broth for a cleaner flavor. Beef broth is traditional but can taste metallic if store-bought.
- Homemade French Bread and Cheese: A slice of crusty bread topped with melted Gruyere completes the soup. Gouda, Swiss, Fontina, or Mozzarella are great alternatives. Use extra bread and cheese in an open-faced croque madame.
Recipe Variations
Here are some delicious ways to customize your French Onion Soup:
- Vegetarian Version: Use vegetable broth instead of beef or chicken broth. Add a splash of soy sauce or vegetarian Worcestershire sauce for a richer flavor.
- Wine-Free Option: Skip the red wine and deglaze the pan with broth for a flavorful, alcohol-free alternative.
- Heartier Soup: Add thin slices of cooked beef or shredded chicken to turn your soup into a filling, complete meal.
How To Make French Onion Soup
These photos and instructions are here to help you visualize how to make a single serving of French onion soup. See the recipe box below for ingredient amounts and full recipe instructions.
- Caramelize the Onions
- Melt the butter in a 2-quart saucepan over medium heat.
- Add the sliced onions, garlic, thyme, salt, and pepper. Cook for about 25 minutes, stirring occasionally, until the onions are very soft and caramelized.
Tip: Take your time with the onions—caramelizing slowly over medium heat brings out their natural sweetness and builds the rich flavor this soup is known for.
- Deglaze with Wine
- Pour in the wine and bring it to a boil.
- Reduce the heat to a simmer and cook until the wine evaporates, about 5 minutes.
- Thicken the Soup
- Sprinkle the flour over the onions and stir to combine.
- Lower the heat to medium-low and cook for 10 minutes, stirring occasionally to prevent the flour from burning.
- Simmer with Broth
- Stir in the chicken broth and bring the soup back to a gentle simmer.
- Let it cook for 10 minutes, stirring occasionally.
Prepping The Bread
While the soup simmers, get your bread ready to top off the dish.
- Broil the Bread
- Heat the broiler. Place the slice of French bread on a baking sheet.
- Sprinkle Gruyere cheese generously over the bread.
- Broil for 3-4 minutes, or until the cheese is bubbly and golden brown.
- Serve
- Place the cheesy bread in a soup bowl and pour the hot soup over it. Enjoy immediately.
Expert Tips
- Slice Onions Thinly: Thin, even slices caramelize more evenly and ensure every spoonful of soup has tender, flavorful onions.
- Low and Slow Cooking: Patience is key when caramelizing onions. Cooking them over low to medium heat allows their natural sweetness to develop fully without burning.
- Gruyere Cheese: Gruyere melts beautifully and delivers the classic nutty flavor that defines French Onion Soup. If unavailable, try Gouda, Fontina, or Mozzarella.
- Selecting the Best Broth: Beef broth is traditional, but store-bought varieties often have a metallic taste that can overpower the soup. Chicken broth provides a more balanced, mild flavor and works wonderfully in this recipe. If you’re aiming for a vegetarian version, high-quality vegetable broth is another excellent option.
Frequently Asked Questions
Yellow onions are the best choice for their natural sweetness, but you can use white onions or even red onions if needed.
You can substitute the wine with additional broth. Wine adds depth and richness, but the soup will still taste great without it.
Store any leftover soup in an airtight container in the fridge for up to 3 days. Reheat gently on the stove over low heat.
RELATED: Single Serving Comfort Food Recipes
Ways To Use Leftover Ingredients
If you have any ingredients leftover from this recipe, check out our Leftover Ingredients Recipe Finder or you might like to consider using them in any of these single serving and small batch recipes:
If you’ve tried this single serve French onion soup recipe or any recipe on One Dish Kitchen please let me know how you liked it by rating the recipe and telling me about it in the comment section below.
If you take a picture please tag us on Instagram (@onedishkitchen) we’d love to see it!
French Onion Soup For One
Watch How To Make This
Equipment
Ingredients
- 3 tablespoons salted butter
- 1 small yellow onion -halved, then thinly sliced
- 1 clove garlic -chopped
- ½ teaspoon dried thyme
- ¼ teaspoon kosher salt
- ⅛ teaspoon coarsely ground black pepper
- ¼ cup red wine
- 1 tablespoon all-purpose flour
- 2 cups low sodium chicken broth
- 1 thick slice French bread
- ¼ cup shredded Gruyere cheese
Instructions
- Caramelize the Onions: Melt the butter in a 2-quart saucepan over medium heat. Add the sliced onions, garlic, thyme, salt, and pepper. Cook, stirring occasionally, until the onions are very soft and caramelized, about 25 minutes.
- Deglaze with Wine: Pour in the wine and bring to a boil. Reduce the heat to low and simmer until the wine has evaporated, about 5 minutes.
- Add Flour for Thickening: Sprinkle the flour over the onions and stir to coat evenly. Lower the heat to medium-low and cook for 10 minutes, stirring occasionally to prevent the flour from burning.
- Simmer the Soup: Stir in the broth and bring the soup back to a gentle simmer. Cook for 10 minutes, stirring occasionally. Taste and add more salt if needed.
- Prepare the Cheese Bread: While the soup simmers, heat the broiler. Place the French bread slice on a baking sheet, sprinkle Gruyere cheese on top, and broil until the cheese is bubbly and golden brown, about 3-4 minutes.
- Assemble and Serve: Place the toasted cheese bread in a soup bowl. Pour the hot soup over the bread and enjoy immediately.
Notes
- Slice Onions Thinly: Thin, even slices caramelize more evenly and ensure every spoonful of soup has tender, flavorful onions.
- Low and Slow Cooking: Patience is key when caramelizing onions. Cooking them over low to medium heat allows their natural sweetness to develop fully without burning.
- Gruyere Cheese: Gruyere melts beautifully and delivers the classic nutty flavor that defines French Onion Soup. If unavailable, try Gouda, Fontina, or Mozzarella.
- Selecting the Best Broth: Beef broth is traditional, but store-bought varieties often have a metallic taste that can overpower the soup. Chicken broth provides a more balanced, mild flavor and works wonderfully in this recipe. If you’re aiming for a vegetarian version, high-quality vegetable broth is another excellent option.
Nutrition
The information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for a professional nutritionist’s advice.
This looks absolutely amazing! I really need to give this a try and it’s perfect because I’m really the only one in my house that likes soup!
Wow, I am SO DANG HAPPY I stopped by tonight! This looks absolutely incredible, and I love that I finally have a soup recipe I can make without having 3 weeks worth of leftovers.
French Onion soup is one of my favorite! I’m the only one in my house who likes it so I only get it when I go to a restaurant. Thanks to you now I can make it at home just for me.
French onion soup is one of my absolute favorites! And this recipe looks AMAZING! xx
Beautiful recipe! Isn’t it funny? I don’t like onions at all, but I love french onion soup!! haha I think its the raw onions that mostly turn me off. Love your post!
This soup looks amazing and I love your pictures…so amazing!
Valerie
This is my husband’s favorite soup. He always orders it when we go out and I have never attempted to make it at home…..until now. Thank you so much for breaking it down for me. I can’t wait to try it!!
I love french onion soup so much!
French onion soup is a fantastic Fall meal… going to make this soon!
One of my most favorite soups EVER!