French onion soup

French onion soup

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!

French onion soup

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
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Instructions

Onion soup

  1. Peel and thinly slice the onions and garlic. A food processor or mandolin makes this easier.
  2. 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.
  3. 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.
  4. Mug bread croutons

  5. For the mug bread, grease a large flat-bottomed mug or glass dish with butter.
  6. 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.
  7. 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.
  8. Let cool and remove from the mug. Slice in half and toast.
  9. 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.

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💬 Have you tried this recipe?

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

14 comments

  1. Janelle Marie Petrow
    How would alter the recipe for a crockpot?
    Reply: #2
  2. Kristin Parker Team Diet Doctor

    How would alter the recipe for a crockpot?

    This recipe has not been tested in the crock pot.

  3. Elizabeth Rand
    Instead of the water and boullion cube, can you use chicken or vegetable broth?
    Replies: #4, #9
  4. Kristin Parker Team Diet Doctor

    Instead of the water and boullion cube, can you use chicken or vegetable broth?

    Yes, that would be fine!

  5. Jennifer
    If you leave out the mug bread, how many carbs are in this soup? My husband loved this soup. So delicious :)
    Reply: #6
  6. Kristin Parker Team Diet Doctor

    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
    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. Kristin Parker Team Diet Doctor

    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. Selina
    I just did it with Chicken. It was yummy!
  10. 1 comment removed
  11. Paula
    Is there any other cheese other than guryere that can be used
    Reply: #12
  12. darkhorse32
    I would think Provolone would be a good substitute. 1oz of provolone has 0.6g of carbohydrate.
  13. adibbens
    i'm not good cooking is there video how cook this?
    Reply: #14
  14. Kristin Parker Team Diet Doctor

    i'm not good cooking is there video how cook this?

    There is not currently a cooking video for this recipe.

  15. Evi
    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. 🥰

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