Rich & Comforting French Onion Soup Recipe Is Low In Carbs by 30Seconds Food

Rich & Comforting French Onion Soup Recipe Is Low In Carbs

French onion soup is a classic. The traditional French recipe is topped with a thick slice of bread or croutons and cheese before being broiled to melt the cheese and toast the bread. If you're eating a low-carb diet or on the keto diet plan, the bread isn't ideal. This easy low-carb French onion soup is made without bread, but you won't miss it. The soup is rich, full of flavor and will fill you up.

The soup base is made with butter, onions, garlic, bay leaves, fresh thyme leaves, beef broth and a little cornstarch to thicken. Wondering if you can eat onions while on a low-carb diet? It turns out that not all carbohydrates are created equal. When it comes to low-carb diets, eating bread is different than eating onions, and because of their strong flavor, you may typically eat less of them than other carbs.

The onions are first cooked in butter until they get rich, golden brown, sweet and caramelized. The finished soup is ladled into oven-safe soup bowls, topped with cheese and broiled until ooey, gooey and melty. Delicious!

Serve this French onion soup recipe for lunch or dinner with a crispy garden salad. You could also serve it as an appetizer for a sit-down dinner.

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Cuisine: French
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 4


  • 1/2 cup (1 stick) butter
  • 4 onions, sliced thin
  • 4 cloves garlic, minced
  • bay leaves
  • 1 teaspoon minced fresh thyme 
  • 4 cups beef broth
  • 1/4 teaspoon cornstarch
  • 8 ounces grated gruyere cheese

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Recipe Notes

  • This recipe could be doubled for larger families.
  • Try this recipe with Swiss cheese instead of gruyere.
  • You could top the soup with a slice of low-carb bread.
  • The soup reheats will for lunch the next day. 

Here's how to make it: 

  1. Melt the butter in a large soup pot over medium-high heat. Add the onions, garlic, thyme and bay leaves. Season with salt and pepper. Cook, stirring often, until onions are soft and caramelized, about 15 to 20 minutes. 
  2. Reduce heat to medium-low and add the beef broth and cornstarch. Bring soup to a simmer and cook 10 minutes. (If you want the soup thicker, add more cornstarch.) 
  3. Ladle the soup into four oven-safe soup bowls. Sprinkle with the cheese. Put the bowls on a baking sheet and under the broiler until golden and melted.

Nutrition Facts Per Serving

Calories: 544

Total Fat: 42.6g

Saturated Fat: 25.5g

Cholesterol: 123mg

Sodium: 677mg

Total Carbohydrate: 20.2g

Dietary Fiber: 2.4g

Total Sugars: 4.8g

Protein: 21g

Vitamin D: 16mcg

Calcium: 616mg

Iron: 1mg

Potassium: 299mg

Recipe cooking times, nutritional information and servings are approximate and provided for your convenience. However, 30Seconds is not responsible for the outcome of any recipe, nor may you have the same results because of variations in ingredients, temperatures, altitude, errors, omissions or cooking/baking abilities. This recipe has been analyzed by VeryWellFit. However, any nutritional information is provided as a courtesy and it is up to the individual to ascertain accuracy. To ensure image quality, we may occasionally use stock photography.

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Jane Robinson
Looks great, but aren't onions rather high in carbs? Some nutritional info would be great!
Elisa Schmitz
Thanks for your feedback, Jane Robinson . We are working on getting nutritional information into our recipes. Thank you for your patience. In the meantime, here's some information about onions and carbs: and Donna John
I love French onion soup. What a treat.

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