Cauliflower and Broccoli Soup

  • 5MINS
  • 30MINS
  • Serves 4
  • 71KCAL

When you need a warming bowl of soup, this slimming friendly Cauliflower and Broccoli Soup is just the ticket – perfect if you're calorie counting or following a plan like Weight Watchers.

  • Batch Cook
  • Everyday Light
  • Freezable
Easy Peasy Cauliflower and Broccoli Soup

NutritionPer Serving

  • Calories71
  • Carbs8g
  • Protein2g
  • Fat0.2g
  • Saturates0.04g
  • Sugars3g

For the full list of ingredients and comprehensive instructions, please see the recipe card below. Before you scroll, there’s important stuff in the blurb!

This Cauliflower and Broccoli Soup is really filling and super warming, which makes it the perfect choice for when the weather starts to get cooler and the nights get longer.

We love our Cauliflower and Broccoli Soup when served with a sprinkle of Stilton or Danish Blue cheese.  We think that the salty flavour of the cheese really stands out against the smooth, fresh taste of the broccoli and cauliflower and adds an extra depth to the soup.  You don’t have to use cheese of course, it’s entirely optional!

This Cauliflower and Broccoli Soup is ready in no time at all and is just as good when reheated for lunch the following day and served with some warm, crusty bread – delish.

What diets is this Cauliflower and Broccoli Soup suitable for?

This Cauliflower and Broccoli Soup recipe is suitable for vegetarian diets.

It can be made gluten free as long as you swap out the following ingredients for gluten free versions;

  • Vegetable stock cubes

It can also be made dairy free by omitting the following optional ingredients or swapping them out for dairy free alternatives;

  • Danish Blue

Please make sure to double or triple check all of your ingredients if you’re cooking for people with allergies.

Do you need any special ingredients to make Cauliflower and Broccoli Soup?

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For the blending of this soup, we’d recommend you use a stick blender or throw it in a blender. As far as stick blenders go, you want one that’s going to last and that has a metal stick.

Hints & Tips

Below we added some of our communities most common hints and tips. We hope you find them useful.

I mistakenly thought this would be bland and boring
I really loved this soup, I must share I did add an extra onion and a good pinch of black pepper - soupa lunchtime snack for slimmers
Another first, wow beautiful so tasty I added 1/2 tsp ground ginger sprinkled reduced fat cheddar in the top definitely one of my new favourites.

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This Andrew James Powerful 3-in-1 Hand Blender is fab! It also has one of the highest ratings on Amazon.

How many calories are in this Cauliflower and Broccoli Soup?

There are 71 calories per portion in this Cauliflower and Broccoli Soup, which means it falls into our Everyday Light category. 

This Cauliflower and Broccoli Soup is perfect if you’re following a calorie controlled diet and fits well with any one of the major diet plans such as Weight Watchers. 

As a guide, an average man needs around 2,500kcal (10,500kJ) a day to maintain a healthy body weight. For an average woman, that figure is around 2,000kcal (8,400kJ) a day. Obviously, if your goal is to lose weight then you might want to adjust these slightly! You can read more about these recommendations on the NHS website.

What could I serve with this Cauliflower and Broccoli Soup?

This Cauliflower and Broccoli Soup works really well when served alongside any of the following accompaniments:

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How do you know when Cauliflower and Broccoli Soup is cooked?

You’ll need to cook this Cauliflower and Broccoli Soup for around 25-30 minutes or until it’s thickened and has a smooth consistency.

Standard advice here in the UK is to cook food until it has reached 70°C and stayed at that temperature for 2 minutes. This is to keep your family safe.

How long can you keep Cauliflower and Broccoli Soup in the fridge?

Once you’ve put it out, ideally you should eat it within 4 hours.

If you allow any leftovers to cool, make sure to refrigerate in a container with a lid and chill.  You can keep leftovers of Cauliflower and Broccoli Soup in the fridge for approximately 3 days or so. 

Can I freeze this Cauliflower and Broccoli Soup?

Yes you can! This recipe can be frozen, but please remember to do the following;

  • Freeze it as soon as it is cold enough.
  • Use a container or bag that is suitable for freezing.

Don’t forget to add a label with what it is, and on what date you put it in the freezer!

How do I reheat Cauliflower and Broccoli Soup?

From chilled: Place in a microwave proof container with loosely fitting lid and heat for 4-7 minutes until piping hot.

From frozen: Allow to defrost, and heat covered in the microwave for 3-5 minutes then stir. Cook for a further 5-7 minutes until piping hot.

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Cauliflower and Broccoli Soup

When you need a warming bowl of soup, this slimming friendly Cauliflower and Broccoli Soup is just the ticket - perfect if you're calorie counting or following a plan like Weight Watchers.
  • Prep Time
    5 MINS
  • Cook Time
    30 MINS
  • KCals 71
  • Carbs 8G


  • ½ head cauliflower cut into florettes
  • ½ head broccoli cut into florettes
  • 2 vegetable stock cubes or chicken if you prefer
  • 1 litre water
  • ½ onion chopped roughly
  • 35 g danish blue optional
  • sea salt
  • freshly ground black pepper
  • low calorie cooking spray

We use a fan assisted oven for all of our recipes. Check out our oven temperature conversion guide.

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  1. Spray a pan with low calorie cooking spray, then sauté the onion until it starts to soften.
  2. Chop up the cauliflower and broccoli into florets, then add these to the pan.
  3. Pour in the water, then add the stock cubes.
  4. Bring to the boil, stir, then cover and simmer for 25-30 minutes.
  5. Remove from the heat, then blitz until smooth using a stick blender.
  6. Check the seasoning and add a little salt and pepper if necessary. Serve on its own, or sprinkled with a little Danish Blue or Stilton.

Looking for Slimming World Syns or Weight Watchers (WW) Points?

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See what others have to say

IonaFriday 10th May 2019

Not fond of blue cheese, will this recipe work with cheddar or something similar instead?


    CateMonday 3rd June 2019

    Yes you could try substituting, we would recommend a very strong cheddar 🙂


Natalie EdmondSunday 6th January 2019

Hi can you freeze this soup ?????


RichSaturday 5th January 2019

Hello, looking forward to trying this. Just wanted to ask, if using frozen broc and cauli should I reduce the amount of water added with the stock cubes? Thanks.


LucyTuesday 6th November 2018

Hi, will this work in a food processor rather than using a stick blender? Thanks! x


SarahMonday 2nd April 2018

How long will this soup last ince made


Gemma RogersThursday 1st March 2018

Do you think this would work in a slow cooker overnight on low? Ready to blend and take to work in the morning?


Helen SmithTuesday 30th January 2018

Could I do this with frozen cauliflower and broccoli as I’ve got bag in freezer, thanks


MargaretTuesday 14th November 2017

If I add all ingredients to soup maker would I need to sauté onions first or not?? Thanks for any help x


    Pat LambertFriday 22nd January 2021

    Yes. I sauté mine in my soup maker


Tracy SSunday 15th October 2017

Can you just add all the ingredients to a soup maker? I’m new to the soup game!


LyndamrogersMonday 2nd October 2017

Best soup I’ve ever made


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