Low carb Cauliflower Leek Soup is a creamy & rich soup that is chock full of healthy vegetables.

With 8 simple ingredients, it’s so easy to make this cozy and warm dish. Cream of leek soup tastes good on a chilly day, especially with some cheese on top. Cook it on the stovetop or in the slow cooker and enjoy it with a salad or some low carb bread for dipping. Leek potato soup tastes the best when it’s made with cauliflower instead of spuds!

Cauliflower Leek Soup in bowls with parmesan cheese on top

Cauliflower Leek Soup

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Low Carb Leek “Potato” Soup

  • The flavor of this soup is rich & creamy, but low carb! Enjoy it as a starter or have it for lunches alongside some Easy Chicken Lettuce Wraps. Or serve it simply with some Chaffles for dipping!
  • Cauliflower leek soup can be made on the stovetop and be ready in under an hour. Or go for a Crockpot method and cook it low and slow for excellent flavor.
  • Customize to taste preferences. It’s a forgiving recipe so mix in some extras or add toppings like cheese, sour cream, bacon, or green onions.

Easy Low Carb Ingredients

VEGETABLES – Leeks and cauliflower are both extremely healthy vegetables, and they taste great together. Mash and add lots of garlic for an even more savory flavor!

DAIRY – Cream & butter add a rich and creamy texture to the broth. Don’t worry about the calories, with a keto diet cream is not off-limits!

BROTH – Use homemade chicken broth or store-bought, just make sure the ingredients are low carb. Bouillion can also be used.

ingredients for Cauliflower Leek Soup

Vegetable Preparation

Since this is a pureed soup, the vegetables can be roughly chopped. But be sure to wash all vegetables thoroughly.

How To Prepare Leeks For Soup

Leeks can have a lot of sand in the inner layers. Slice the root end off and discard. Then slice the leeks into 1-inch rings, and transfer them to a bowl of water. Let the leeks soak for 5 minutes, then rinse thoroughly in a colander.

How To Prepare Cauliflower

Cauliflower can also have sand and dirt trapped inside. Remove the outer leaves, and cut around the core to remove. Chop cauliflower roughly into florets. Soak pieces in a bowl of water, then rinse in a colander. The white stems should be used as well.

Let’s Make It!

Once vegetables are chopped and washed, the rest is so easy. Peel and mince the garlic. Get all the ingredients ready. Then simply saute, simmer, and blend!

Quick Stovetop Method

  1. Saute garlic, leeks and cauliflower.
  2. Add chicken broth and simmer (as per the recipe below).
  3. Blend using an immersion blender. Add cream and season to taste.

Slow Cooker

  1. Saute garlic, leeks and cauliflower (as per the recipe below)
  2. Add chicken broth and bring to a boil.
  3. Transfer mixture to preheated Crockpot and continue cooking on high for 4 hours or low for 6 hours.
  4. Once vegetables are cooked and soft, puree
  5. Add cream, season and cook for ½ hour longer.

cauliflower and leeks in a pot for Cauliflower Leek Soup

Recipe Tips & Tricks

  • Add more or less garlic to soup, according to taste preferences.
  • Other low-carb vegetables can be incorporated if desired.
  • For a vegan version, use vegetable broth in place of chicken, and skip the butter.

How To Make Soup Thicker

For a thicker soup, try reducing it down on the stovetop with the lid off. Be sure to stir regularly, and don’t bring to a boil if the cream has been added. For a quicker method, use psyllium husk flour, which is keto-friendly and works well as a thickener. Add a little at a time, stirring constantly.

How To Store

Cauliflower leek soup will last in the refrigerator for four days, and in the freezer for several months. Store in freezer bags with all the air pressed out, or in air-tight containers.

Cauliflower Leek Soup in a pot with parmesan cheese on the side

Other Delicious Creamy Soups To Try!

Cauliflower Leek Soup in bowls with parmesan cheese on top
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Cauliflower Leek Soup

Low carb cream of leek soup uses simple and flavorful ingredients to create a thick and rich soup that everyone will love. 
Prep Time 15 minutes
Cook Time 50 minutes
Total Time 1 hour 5 minutes
Servings 4 servings
Author Holly


  • 2 Tablespoons olive oil
  • 3 Tablespoons butter
  • 3 garlic cloves minced
  • 3 leeks cut into 1-inch pieces
  • 1 head cauliflower 4-5 cups
  • 3 cups chicken broth
  • 1 cup heavy cream
  • salt and pepper to taste


  • In a large pot heat olive oil, butter, and garlic over medium heat. Add leeks and cauliflower and saute for 10 minutes.
  • Add the chicken broth and bring the mixture to a boil then reduce heat to a simmer. Cover and simmer for 30 minutes or until vegetables are soft.
  • Blend the soup with an immersion blender or hand mixer. Mix in the heavy cream and continue to blend until the soup is smooth. Season with salt and pepper to taste.


To thicken soup, reduce it down on the stovetop with the lid off and stir regularly. Or use psyllium husk flour mixed with a bit of water, slowly a little at a time, stirring constantly.
Refrigerate soup for about 4 days in an airtight container. Freeze in a zippered freezer bag for 2-3 months. 
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Nutrition Information

Calories: 451kcal | Carbohydrates: 21g | Protein: 9g | Fat: 39g | Saturated Fat: 21g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 14g | Trans Fat: 1g | Cholesterol: 104mg | Sodium: 208mg | Potassium: 758mg | Fiber: 4g | Sugar: 6g | Vitamin A: 2250IU | Vitamin C: 78mg | Calcium: 123mg | Iron: 2mg

Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.

Course Main Course, Soup
Cuisine American

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Cauliflower Leek Soup in bowls with parmesan cheese and writing

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About the author

At Easy Low Carb® we believe that every meal should be full of big bold flavor! From amazing main dishes and simple sides to the best party snacks, reducing carbs doesn’t mean giving up your favorites!
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  1. 5 stars
    Delicious. I added a couple of tablespoons of sour cream when it was being pureed. And I added a teaspoon of shredded parm to my bowl of soup. Yummy!