Keto French Onion Soup

Last Updated on April 30, 2025

Stay warm with this Keto French onion soup! With beef stock base, slow-cooked caramelized onions, pork rings, Gruyere and Parmesan cheese. Is there anything more comforting on a chilly day than a hot bowl of French onion soup?

The weather is drizzly and cold in Portland and all I’m thinking about is comfort food.

Truth be told, I’m not a big soup person however, I have a whole lot of love for French Onion soup.

When I went Keto, I knew I had to find a recipe to enjoy so low so I was tickled pink when I received Keto Essentials by Vanessa Spina and saw her recipe for Keto French Onion Soup.

This keto diet book is a MUST for every Keto kitchen and has so many amazing tasty recipes that will keep your belly happy.

Why we love this low carb french onion soup

• It’s packed with flavor from rich bone broth
• The caramelized onions add an umami flavor to the soup (yes, onions are keto!)
• It’s low in carbs – only 8 per serving! Pst. Check out this awesome Keto Onion Rings recipe if you want a low carb treat.

What you’ll need for this recipe

• Salted butter
• Yellow onions –
• Green onions
• Erythritol
• Garlic, minced
• Xanthan gum
• Beef bone broth
• Apple cider vinegar
• Aprigs fresh thyme
• Bay leaf
• Fine sea salt
• Ground black pepper
• Pork rinds
• Gruyère cheese, shredded
• Parmesan cheese, grated

In a medium saucepan over medium-low heat, melt the butter.  Add the yellow and green onions and cook for 8 to 10 minutes, until translucent.

Add the erythritol and continue to cook, stirring frequently with a wooden spoon, until the onions brown, about 5 minutes.

Add the garlic and xanthan gum and blend well, then add the broth, vinegar, thyme, bay leaf, salt, and pepper.  

Cover and simmer on low heat for about 20 minutes.

Meanwhile, preheat the broiler.  Cut each pork rind into 3 or 4 “croutons.”

Divide the broth between 4 ovenproof bowls.  Cover each bowl with one-quarter of the pork rinds and 2 tablespoons of each of the cheeses.  Broil until the cheese is melted.

Do onions have carbs?

Yes, one medium onion has 10 carbs

Can I remove the gum from the recipe?

yes, however it will not thicken up.

If you like this Keto French Onion Soup recipe, you’ll love:

Keto Dairy Free Clam Chowder

Keto Fried Chicken Taco Shell (Whole30)

Keto Calzone

Did you make and love this recipe?  Give your review below and make sure you share your creations by tagging me on Instagram!

Simple Keto French Onion Soup (Rich and Cheesy)

Course: Soup

Cuisine: French

Keyword: keto french onion soup

Prep Time: 10 minutes

Cook Time: 35 minutes

Total Time: 45 minutes

Servings: 4

Calories: 1335 kcal

Author: Kelly Bejelly

Stay warm with this Keto French onion soup! With beef stock base, slow-cooked caramelized onions, pork rings, gruyere and Parmesan cheese. Is there anything more comforting on a chilly day than a hot bowl of French onion soup?

Print

Ingredients

• ¾ cup salted butter
• ½ cup sliced yellow onions
• ¼ cup sliced green onions
• 1 teaspoon erythritol or 2 to 4 drops liquid stevia
• 2 cloves garlic minced
• 1/8 teaspoon xanthan gum
• 4 cups beef bone broth
• 1 tablespoon apple cider vinegar
• 1 to 2 sprigs fresh thyme
• 1 bay leaf
• ½ teaspoon fine sea salt
• ¼ teaspoon ground black pepper
• 6 oz pork rinds
• ½ cup Gruyère cheese shredded
• ½ cup Parmesan cheese grated

Instructions

1. In a medium saucepan over medium-low heat, melt the butter. Add the yellow and green onions and cook for 8 to 10 minutes, until translucent.  Add the erythritol and continue to cook, stirring frequently with a wooden spoon, until the onions brown, about 5 minutes.
2. Add the garlic and xanthan gum and blend well, then add the broth, vinegar, thyme, bay leaf, salt, and pepper.  Cover and simmer on low heat for about 20 minutes.
3. Meanwhile, preheat the broiler.  Cut each pork rind into 3 or 4 “croutons.”
4. Divide the broth between 4 ovenproof bowls.  Cover each bowl with one-quarter of the pork rinds and 2 tablespoons of each of the cheeses.  Broil until the cheese is melted.

Nutrition Facts

Simple Keto French Onion Soup (Rich and Cheesy)

Amount Per Serving (1 g)

Calories 1335 Calories from Fat 909

% Daily Value*

Fat 101g155%

Saturated Fat 49g306%

Trans Fat 2g

Polyunsaturated Fat 41g

Cholesterol 354mg118%

Sodium 1897mg82%

Carbohydrates 9g3%

Fiber 1g4%

Sugar 2g2%

Protein 96g192%

* Percent Daily Values are based on a 2000 calorie diet.