French Onion Soup is one of the most delicious soups that most people enjoy only when they're dining out in a restaurant. Today I'm going to show you how to make one of my favorite Best Fall Soup Recipes that's topped with homemade croutons and tons of cheese!
This recipe has been updated since it first appeared in 2014 with new photos and a new printable recipe card that includes nutritional information. I hope you enjoy the updates as much as I enjoyed working on them!
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French Onion Soup
French Onion Soup is one of my favorite soup recipes! My husband and I love ordering French Onion Soup when we go out to dinner.
You might think this soup is difficult to make, but after you see the video below, you'll agree it's a recipe anyone can make right at home in their own kitchen.
This recipe is not only great for dinner, but any leftovers freeze beautifully. On busy days, I take a container of this soup out of the freezer to enjoy for dinner.
Tips for Making Homemade French Onion Soup
- Traditional French Onion Soup recipes use Gruyere cheese or provolone cheese.
- I'm using mozzarella cheese for French Onion Soup.
- Another way to make this recipe is easy is by using homemade croutons instead of a single thick slice of French bread. It's so much easier to enjoy the soup without having to try breaking the thick sliced bread into pieces. Or am I the only one that has problems doing that?
- You'll notice that there is no alcohol added to this recipe.
Make sure you print out the recipe below and save it for later!
- Thinly sliced yellow onions- you need about 5 cups of onions, so I suggest using a food processor, but a sharp knife works great too!
- Bay Leaf
- Beef Broth
- Sugar - I've had a few people email me asking why you need to add sugar to the onions and not only does it add flavor, but it helps caramelize the onions to get that deep rich color.
- Salt and pepper - this is for the homemade croutons. The beef broth should have enough salt. However, taste the soup after it has cooked and add more if you need to.
- Loaf of French bread to make homemade croutons
- Mozzarella cheese
- Parmesan cheese
In a large stock pot, melt the butter and add the sliced onions. After a few minutes of cooking, add the sugar and continue to cook the onions slowly, stirring frequently, for about 30 minutes; until they turn a deep golden brown. Next, add the flour and cook for another few minutes.
This is the color the onions should be after they have cooked for about 30 minutes. They are a beautiful deep golden brown.
Now, add the beef broth and bay leaf. Allow the French onion soup to simmer for another 30 minutes. Taste the soup and see if it needs any salt or pepper. I always wait till the end to season as the broth can add enough saltiness.
Easy French Onion Soup Recipe with Croutons
Traditionally, you add a thick slice of French bread. Then it's topped with cheese and placed under the broiler until the bread and cheese are melted. I find it easier to enjoy the soup by adding homemade croutons instead of a thick slice of bread.
How to Make Homemade Croutons:
- Slice the French bread into cubes.
- Butter each cube as you place them on a baking sheet lined with either aluminum foil or parchment baking sheets.
- Sprinkle with salt and butter.
- Place the baking tray under the broiler for a few minutes until the homemade croutons are golden brown.
How to Serve the Soup:
Spoon the soup into an oven-safe bowl and top with the homemade croutons.
Top with the homemade croutons.
Then add about 2 tablespoons of mozzarella cheese on top of the croutons.
Place the bowls of soup under the broiler for a few minutes or until the cheese is melted.
Sprinkle Parmesan cheese on top before serving.
Helpful Kitchen Tools:
- Mandolin slicer - this tool will get your onions really, really thin. Just make sure you use the safety guard!
- Stainless Steel Cheese Grater
- Oven-proof soup bowls
- Dutch Oven Stock Pot - I love to cook with cast iron.
You Might also Enjoy these Soup Recipes:
- Homemade Potato Corn Chowder
- Italian Tomato Soup - with grilled cheese croutons!
- Homemade Potato Soup
- 5 cups of thinly sliced yellow onions
- 4 tbsp butter
- 1 bay leaf
- 8 cups beef broth
- 3 tbsp flour
- 1 tsp sugar
- Salt and pepper - to taste
- 1 small loaf of French Bread cut into cubes
- ¼ cup softened butter
- 2 cups Mozzarella cheese
- ¼ cup Parmesan cheese
How to Prepare the Soup
- In a large stock pot, melt the butter and add the sliced onions.
- After a few minutes of cooking, add the sugar and continue to cook the onions slowly, stirring frequently, for about 30 minutes; until they turn a deep golden brown.
- Add the flour and cook for another few minutes.
- Then add the beef broth, bay leaf and allow the soup to simmer for another 30 minutes.
- Taste the soup and see if it needs any salt or pepper. I always wait till the end to season as the broth can add enough saltiness.
- Remove the bay leaf and keep the soup warm while you prepare the homemade croutons.
How to Prepare the Homemade Croutons
- Cut the French bread into cubes and spread the softened butter on top. Sprinkle with salt and pepper if desired.
- Place them on a parchment lined baking sheet and toast them in a preheated 425 degree oven for about 5 to 8 minutes or until they are golden browned.
How to Put the Soup Together
- Spoon the soup into an oven-safe bowl and top with the homemade croutons.
- Then sprinkle about ¼ to ⅓ cup of mozzarella cheese to the top of each bowl.
- Place the bowls of soup under the broiler for a few minutes or until the cheese is melted.
- Sprinkle freshly grated Parmesan cheese on top before serving.
Traditionally, Gruyere cheese is used for French Onion Soup. I have used Swiss cheese, Mozzarella cheese and Provolone cheese. Any flavor of cheese really works with this recipe, so choose your favorite!
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Nutrition Information:Yield: 6 Serving Size: 1
Amount Per Serving: Calories: 416Total Fat: 26gSaturated Fat: 16gTrans Fat: 1gUnsaturated Fat: 8gCholesterol: 74mgSodium: 1741mgCarbohydrates: 30gFiber: 3gSugar: 10gProtein: 17g
The nutrition information is calculated automatically. I cannot guarantee its accuracy. If this data is important to you, please verify with your trusted nutrition calculator.
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