Potato-Cauliflower Soup

Potato-Cauliflower Soup by 2sistersrecipes.com

Potato-Cauliflower Soup is a creamy and comforting soup loaded with leftover mashed potatoes, mashed cauliflower, and some Parmesan cheese.  Best of all, this luscious and creamy texture soup is made without a ton of butter and no cream, making it fewer in calories and fat for everyone to love!



Potato-Cauliflower Soup by 2sistersrecipes.com


Here is another delicious way to use your cauliflower!  Add them to soups!  This recipe idea came from my homemade recipe for Mashed-Cauli Potatoes.

Potato-Cauliflower Soup is not only very tasty, but it’s less starchy compared to a creamy potato soup.

My family loves soups, especially creamy texture ones.  Since they were craving for one, I decided to come up with a new one.

I had some leftover mashed potatoes from the night before and decided to make a soup with them. So I took those leftover mashed potatoes and mixed it with steamed cauliflower, onions, vegetable broth, and grated Parmesan cheese. 

And this potato-cauliflower soup was born!



Potato-Cauliflower Soup by 2sistersrecipes.com


This soup was not only good, it was much easier to make – for sure!

I love this soup for two reasons; it’s simple and positively delicious!  And it makes my first course ready in no time!

You’ll be amazed how light, creamy and so tasty this soup turned out!

It’s the perfect soup to serve for this season, especially on chilly nights. 




Potato-Cauliflower Soup by 2sistersrecipes.com

And as a final touch, I added a few drops of extra-virgin olive oil on top, to give it an additional savory flavor to the soup.

Everyone enjoyed it!  I guess I will be making this Potato-Cauliflower Soup all winter long, especially when I have leftover mashed potatoes from the night before.  


Here’s a Great Tip:  

If you plan to make mashed potatoes as a side dish for dinner, make extra!  And plan to use the leftovers to make this soup, the very next day.  You can use anywhere from 1  cup to 3 cups of mashed potatoes with this recipe.







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Potato-Cauliflower Soup by 2sistersrecipes.com


Are you cooking or baking with us?  If you try our delicious potato-cauliflower soup, let us know and leave a comment and a star rating in our recipe card!   Have fun and snap a photo and hashtag it on Instagram and on Pinterest; be sure to tag us @2sistersrecipes. 

We’d love to see what you cook! 

Happy Cooking! πŸ™‚



Yield: 4 to 6

Potato-Cauliflower Soup

Potato-Cauliflower Soup

Potato-Cauliflower Soup ~ is a creamy and comforting soup made with leftover mashed potatoes, mashed cauliflower and some Parmesan cheese to create a luscious creamy texture without a ton of butter or cream, making this one fewer in calories and lighter in texture, everyone will love!

Prep Time 5 minutes
Cook Time 10 minutes
Total Time 15 minutes


  • 1 cauliflower- cord, rinsed, cut into pieces
  • 3 cups ( leftover) mashed potatoes
  • 1 Tbsp. extra-virgin olive oil
  • 1 onion- chopped
  • 1 (32 ounce) low-sodium vegetable broth
  • 1/4 tsp. ground nutmeg
  • 1/2 cup grated Parmesan cheese
  • salt and pepper to taste
  • extra-virgin olive oil to garnish


  1. In a large sauce pot filled(1/4 amount) with water, bring water to a boil. Add the cauliflower and cover. Boil cauliflower for about 4 to 6 minutes, until tender. Drain and mash the cauliflower.
  2. In the meantime, sauté onions with olive oil in a small pan until onions become soft and translucent, about 3 to 4 minutes. Transfer onions to the large pot with mashed cauliflower. Turn on low heat and stir the onions with cauliflower for about 1 minute.
  3. Add 3 cups of mashed potatoes, nutmeg, and vegetable broth. Bring soup to a low boil. Then simmer on low heat for about 5 minutes.
  4. Add salt and pepper to taste. Turn off heat. Transfer half the mixture to a blender and blend for a few seconds. Transfer back to the pot. Stir in the grated Parmesan cheese.
  5. Ladle into soup bowls and garnish with a few drops of extra virgin olive oil on top.
  6. Serve immediately.



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Happy Cooking!  

Thanks for stopping by!  πŸ™‚

Anna and Liz

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  1. Hey Anna & Liz! This soup looks great and I love that you used leftover mashed potatoes. I never know what to do with those, as they never taste the same the next night unless you slather them in gravy that is. Cauliflower soup is one of our favorite soups so I'm sure with the addition of mashed potatoes, it would be even better. xoxo, Jackie

  2. Anyone who is able to take something as mundane sounding as cauliflower and potatoes and put them together in a soup that looks this delicious, beautiful, and appetizing, is in possession of nothing less than pure talent. Great job with this post; I love it!

    1. Thanks Tricia. My husband is always skeptical when I am experimenting with food, especially when its for dinner; but he absolutely LOVED this one, and that's not always the case in my house. I hope your family will enjoy it as much. πŸ™‚