Low Carb French Onion Soup - Recipe

A classic French low carb soup that tastes even better in the blustery seasons. The cold's got nothing on you with this luxurious but budget-friendly onion soup!

January 8 2019 recipe by Anne Aobadia, photo by Emma Shevtzoff, nutritional review by Franziska Spritzler, RD, CDE in Recipes, Dinner, Meal

A classic French low carb soup that tastes even better in the blustery seasons. The cold's got nothing on you with this luxurious but budget-friendly onion soup!

USMetric

4 servingservings

Ingredients

Onion soup

1¾ lbs (5 cups) 800 g (1.2 liters) yellow onionyellow onions
2 2 garlic clovegarlic cloves
2 oz. 55 g butter
1 tbsp 1 tbsp olive oil
3 cups 700 ml water
2 2 vegetable bouillon cubevegetable bouillon cubes
¾ cup 180 ml white wine, dry
1 1 bay leafbay leaves
1 tbsp 1 tbsp dried sage
1 tsp 1 tsp dried thyme
1¼ cups (4¾ oz.) 300 ml (140 g) gruyère cheese, shredded

Mug bread croutons

1 tsp 1 tsp butter
1 tbsp 1 tbsp almond flour
1 tbsp 1 tbsp coconut flour
¾ tsp ¾ tsp baking powder
1 pinch 1 pinch salt
1 1 eggeggs
1 tbsp 1 tbsp heavy whipping cream

This recipe has been added to the shopping list.

www.dietdoctor.com

Making low carb simple

Instructions

Onion soup

Peel and thinly slice the onions and garlic. A food processor or mandolin makes this easier.
Add butter and oil to a skillet over medium heat. Add the onions and garlic and sauté for about 30 minutes until soft. They should turn a nice golden color, not too brown.
Add water, bouillon, wine, and spices. Bring to a boil then reduce the heat to low, and let it simmer for 15-20 minutes. Season with salt and pepper to taste.

Mug bread croutons

For the mug bread, grease a large flat-bottomed mug or glass dish with butter.
Combine all dry ingredients in the mug with a fork or spoon. Crack in the egg and stir in the cream. Combine until smooth and make sure there are no lumps.
Microwave on high (approximately 700 watts) for 2 minutes. Check if the bread is done in the middle – if not, microwave for a few more seconds.
Let cool and remove from the mug. Slice in half and toast.
Divide the onion soup between ovenproof bowls. Top with the bread slices and shredded cheese. Broil at 410°F (210°C) for 5-7 minutes, until the cheese has melted and turned golden.

Tip

Feel free to mix different kinds of onions, the flavor will become even more exciting. Half of it could be yellow onions, then fill up the rest with red onions, shallots, white onions or leek. Use whatever you have at home!

Recommended special equipment

Food processor or mandolin, and microwave oven.

←

💬 Have you tried this recipe?

What did you think? Please share your thoughts in the comment section below!

14 comments

1
Janelle Marie Petrow
February 25 2019
How would alter the recipe for a crockpot?
Reply: #2
2
Reply to comment #1 by Janelle Marie Petrow
Kristin Parker Team Diet Doctor
February 26 2019
How would alter the recipe for a crockpot?
This recipe has not been tested in the crock pot.
3
Elizabeth Rand
March 3 2019
Instead of the water and boullion cube, can you use chicken or vegetable broth?
Replies: #4, #9
4
See Also
Keto Mashed Cauliflower Recipe with Cream Cheese
Reply to comment #3 by Elizabeth Rand
Kristin Parker Team Diet Doctor
March 4 2019
Instead of the water and boullion cube, can you use chicken or vegetable broth?
Yes, that would be fine!
5
Jennifer
April 5 2019
If you leave out the mug bread, how many carbs are in this soup? My husband loved this soup. So delicious :)
Reply: #6
6
Reply to comment #5 by Jennifer
Kristin Parker Team Diet Doctor
April 6 2019
If you leave out the mug bread, how many carbs are in this soup? My husband loved this soup. So delicious :)
The mug bread is listed as a stand alone recipe at the link below and is 3g net carbs.
https://www.dietdoctor.com/recipes/low-carb-mug-bread
7
Beth Loft
July 25 2019
for those of us without a microwave cooking facility... I imagine that Cloud Bread, toasted to help it keep together, would do the job?
Reply: #8
8
Reply to comment #7 by Beth Loft
Kristin Parker Team Diet Doctor
July 26 2019
for those of us without a microwave cooking facility... I imagine that Cloud Bread, toasted to help it keep together, would do the job?
I am not sure the Cloud Bread would be the right texture from the mug bread. Here is the stand alone recipe for the mug bread which includes oven baking times and temperature.
https://www.dietdoctor.com/recipes/low-carb-mug-bread
9
Reply to comment #3 by Elizabeth Rand
Selina
August 5 2019
I just did it with Chicken. It was yummy!
1 comment removed
11
Paula
February 2 2020
Is there any other cheese other than guryere that can be used
Reply: #12
12
Reply to comment #11 by Paula
darkhorse32
September 23 2020
I would think Provolone would be a good substitute. 1oz of provolone has 0.6g of carbohydrate.
13
adibbens
July 2 2021
i'm not good cooking is there video how cook this?
Reply: #14
14
Reply to comment #13 by adibbens
Kristin Parker Team Diet Doctor
July 2 2021
i'm not good cooking is there video how cook this?
There is not currently a cooking video for this recipe.
15
Evi
April 24 2022
I tried this today. I didnt make the bread with it only the soup. It was amazing! I really need to stop myself from going back for a second bowl. I did put a lot more garlic in than the recipe suggests as I love garlic. 🥰

Low Carb French Onion Soup - Recipe - Diet Doctor (2024)