This Instant Pot Cauliflower Leek Soup is smooth, creamy, and flavorful, and comes together in minutes with just a handful of ingredients.

instant pot cauliflower leek soup in a white pot on a marble board

The humble cauliflower is arguably the trendiest vegetable right now. It’s been made into pizza crust, gnocchi (hello, cauliflower gnocchi sausage skillet), pretzels, and regularly used as a substitute for rice and mashed potatoes. These days, cauliflower can be anything you want it to be! But for this recipe, we’re keeping it simple and going back to cauliflower’s roots.

Here, cauliflower’s mild flavor and creamy consistency really shine, especially when accompanied by the sweet, mellow onion flavor of the leeks. This soup also happens to be totally dairy-free. We opted for coconut milk to add just a bit of creaminess because the pureed cauliflower does most of the heavy lifting for you. A little bit of lemon juice and thyme at the end ties everything together. This soup is so satisfying, easy to make, and it cooks up quickly in the Instant Pot. This is one you’ll want to make again and again this winter!

cauliflower, sliced leeks, a lemon cut in half, thyme, and chicken stock in a glass measuring cup on a marble board

Leeks look a lot like large green onions and are in the same family. They have a mild onion flavor and are especially tasty in soups like this one. Typically, you only eat the white and light green parts of the leek, though the dark green parts are great to save for making stock.

One thing to know before using leeks is that they are notoriously dirty – dirt and sand hide in between the layers, so you want to make sure you really clean them well! First, you’ll remove the inedible dark green parts of the leek, then you’ll slice it in half, leaving the root intact. Then, either fill up your sink or a large bowl with water and place the leeks inside. Swirl them around until you see some of the dirt start to fall out, then remove from the bowl and run them under the faucet. After this, they’re ready to chop!

Instant pot cauliflower soup in a white pot on a marble board

How to Make Instant Pot Cauliflower Soup

The process of making this cauliflower soup couldn’t be easier!

  1. Saute the leeks and garlic. First, you’ll get the soup started by sauteing the leeks using the ‘Saute’ function of your Instant Pot. Simply melt a little bit of butter, add the leeks, and cook for 4-5 minutes, until the leeks are softened. Then, add 3 cloves of minced garlic and saute for about 1 minute, until fragrant.
  2. Add the broth and cauliflower. Next, pour in 5 cups of broth, whisking to scrape up any browned bits on the bottom of the pot, then add in the cauliflower florets, thyme, and salt.
  3. Cook for 5 minutes. Once your ingredients are in the pot, place the lid on top, seal the pot, and set it to cook for 5 minutes. Once the timer goes off, you can either wait for the pressure to release naturally, or you can do a quick release.
  4. Blend the soup. Next, you’ll blend the soup either by transferring to a high-powered blender (you’ll need to do this in 2 batches) or by using an immersion blender.
  5. Stir in the coconut milk and lemon juice. To finish off the soup, stir in coconut milk and lemon juice, then taste for seasoning and add more salt if needed.

This creamy cauliflower soup would be great served alongside a sandwich, grilled cheese, or a green salad, or you could even add shredded chicken or bacon to it to make it a more filling main dish. We hope you love this soup as much as we do!

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Creamy Instant Pot Cauliflower and Leek Soup

4 — Votes 8 votes
By Cassy Joy Garcia
Prep: 20 minutes
Cook: 5 minutes
Total: 25 minutes
Servings: 6 servings
This soup is creamy, delicious, and cooks up in minutes in the Instant Pot!


  • 1 tablespoon butter or extra-virgin olive oil
  • 2 leeks cleaned and roughly chopped, white and light green parts only
  • 3 cloves garlic minced
  • 2 medium heads of cauliflower chopped into florets (or about 7 cups of florets)
  • 5 cups chicken or vegetable stock
  • 2 teaspoons fresh chopped thyme
  • 1 teaspoon coarse salt
  • 1/2 cup full-fat coconut milk
  • 2 tablespoons lemon juice about 1 lemon


  • Set the Instant Pot to ‘saute’ mode and add the butter to the pot. Once melted, add the leeks to the pot and cook for 4-5 minutes, until soft and wilted. Add the garlic and cook for an additional minute, until fragrant, then turn off the pot.
  • Add the chicken stock to the pot and scrape the browned bits off the bottom, then add the cauliflower, thyme, and salt. Seal the pot then hit the ‘manual’ button and set to cook for 5 minutes.
  • After the timer goes off, release the pressure from the pot. Either use your immersion blender to blend the soup in the pot, or add it to a blender, working in batches if needed, and blend until smooth.
  • Add the blended soup back to the pot and stir in the coconut milk and lemon juice. Taste for seasoning and add more salt if needed, then serve.

Recipe Notes

To Make This Soup on the Stovetop:
Follow step one over medium heat on your stovetop, then add the chicken stock, cauliflower, thyme, and salt. Cover and cook for 15 minutes on low heat, then proceed with steps 3 and 4.


Calories: 196kcal | Carbohydrates: 22g | Protein: 10g | Fat: 9g | Saturated Fat: 6g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 0.1g | Cholesterol: 11mg | Sodium: 755mg | Potassium: 894mg | Fiber: 5g | Sugar: 8g | Vitamin A: 591IU | Vitamin C: 100mg | Calcium: 76mg | Iron: 3mg

Additional Info

Course: Dinner
Cuisine: American
Servings: 6 servings
Calories: 196
Keyword: creamy, dairy free, leeks, paleo, soup, vegan, vegetarian, whole30

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About the Author

Cassy Joy Garcia, NC

Cassy Joy Garcia, a New York Times best-selling author, of Cook Once Dinner Fix, Cook Once Eat All Week, and Fed and Fit as well as the creative force behind the popular food blog Fed & Fit.

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Recipe Rating


  1. 3 stars
    You NEED to remove the ads from the printable version. I don’t like wasting printer ink. Thank You.

  2. 3 stars
    It was ok, I had to add some garlic and onion powder, more salt and pepper. It needs more acidity so I played around with some vinegars. I ended up adding 1/2 cup of apple cider vinegar. It tasted a lot better.

  3. 5 stars
    Subbed one head broccoli since I did not have two of cauliflower. Delicious!! Great for cooler weather!

  4. 5 stars
    I can’t even express how amazing this soup is!! My husband was scared when I told him the name, but soon after trying it, said it’s his favorite soup!! Thanks for another amazing recipe!!

    1. Yay! That’s so awesome, Christianne! Thanks for sharing this with us!

  5. 5 stars
    Thank you for posting the instant pot directions. This was so easy and turned out so flavorful and delicious. I roasted the cauliflower in the oven for 20 mins on 450 degrees with olive oil, garlic and a few red pepper flakes before adding it in, following your recipe. So good!

  6. 5 stars
    I made this creamy cauliflower and leek soup last night, and it was hit! I am adding it to my dinner menu rotation of autumn recipes. Thank you!