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If you ever find sad looking vegetables in your fridge (who doesn’t?!) you need this Slow Cooker Vegetable Soup recipe in your life!

A great way to transform sad looking veggies into a delicious, thick, velvety soup for lunch or dinner.

A slow cooker pan with cooked vegetable soup on the table, served with crusty bread.

This Slow Cooker Vegetable Soup is a fantastic ‘dump recipe’ – one of those favourites where you can stick all the ingredients in together and let the slow cooker do the rest. Out comes delicious, hearty, healthy soup after just a few hours.

Get all the ingredients prepped and put in a dump bag, then get as many portions in the freezer as you have room for, ready to cook another day when you’re short on time.

It’s also a great one for batch cooking. Freeze the portions once cooked (instructions below).


Why you’ll love this Slow Cooker Vegetable Soup recipe

⭐️ Creamy, warming, delicious

⭐️ A brilliant way to use up vegetables pas their best

⭐️ Low cost ingredients


Close up of cooked slow cooker vegetable soup with parsley on top to serve.

About Slow Cooker Vegetable Soup

Slow cookers really are worth their weight in gold aren’t they? Being able to make soup this easily in one also takes away the need for yet another device in the kitchen. 

OK, you can’t make this recipe quickly like you could in a soup maker, but I prefer the convenience of prepping earlier in the day while leaving a dish to do its thing, and then be ready when you need it. Perfect for those days you know you’ll be out in the cold and want something hot and hearty to come home to!

The beauty of this soup recipe is that it’s so versatile – you can add any veggies you have lying around that need using up, which adds extra flavour and reduces waste too.


Slow Cooker Vegetable Soup Ingredients

Ingredients for slow cooker vegetable soup laid on a counter. Carrots, leeks, onion, parsnip and celery.
  • Onion
  • Celery
  • Carrots
  • Parsnips
  • Leeks
  • Stock cubes – Or powder. I like Marigold brand.
  • Sea salt and freshly ground black pepper – Season well!
  • Single cream – Larger supermarkets sell a pot this size so you won’t waste any.
  • Parsley – It’s worth buying fresh parsley for this recipe as it makes a big difference

It’s worth noting here that this is a great way to use up vegetables past their best. If they are a little soft or wonky, it won’t make any difference to the finished soup.


How to make Slow Cooker Vegetable Soup

Step 1 in the process of how to make slow cooker vegetable soup. Add ingredients and stock.

1. Add the ingredients to the slow cooker and cook as per the recipe below. Remove a couple of ladles of vegetables and set aside.

Step 2 in the slow cooker vegetable soup recipe. When cooked, add cream and parsley.

2. Add the cream and parsley and blend until smooth. Add the reserved vegetables back into the soup and serve.

Hint: I save some vegetables unblended to give texture and make it a little more chunky, but you could blend it all if you prefer.


Substitutions

  • Vegetables – Swap any vegetables or add different ones depending on what you have in your fridge to use up!

Leftovers

In the fridge You can keep this recipe in the fridge for 3 days. Reheat fully in the microwave or on the hob before serving.

In the freezer This recipe freezes well. Just wait until it’s totally cold and then put into a freezer proof container and freeze for up to 3 months. Defrost thoroughly before reheating in the microwave or on the hob.

Why use a slow cooker to make soup?

Saves electricity: These devices are so energy efficient compared to ovens or hobs, using only about 1.3kWh for 8 hours cooking time. The Energy Saving Trust say they use about the same amount of electricity as a standard light bulb.

Depth of flavour: Cooking ingredients long and slow can create a delicious depth of flavour. This soup recipe is a good example of one such dish. So is my French Onion Slow Cooker Soup.

Convenience: There is just something so lifesaving about being able to put everything in and know a meal is going to be ready later, when time might be tighter. Yes it requires a bit of thinking ahead, but the rewards are great. 

Less mess: I find that a quick scurry around to get everything in the slow cooker earlier in the day makes a huge difference how messy the kitchen gets if cooking is happening in real time later on. And if it’s a dump bag recipe from the freezer? You’d barely know anything had happened at all! 

Let me know how you got on and what you thought of these recipes. Please rate the recipe using the ⭐️ below.

Also I’d LOVE to see your cooking creations. If you’d like to share yours with me, you can tag me on Instagram (@tamingtwins).

5 from 56 votes

Slow Cooker Vegetable Soup

This Slow Cooker Vegetable Soup is a fantastic ‘dump recipe’ – one of those favourites where you can stick all the ingredients in together and let the slow cooker do the rest. Out comes delicious, hearty, healthy soup after just a few hours!
Prep Time: 5 minutes
Cook Time: 4 hours
Total Time: 2 hours 5 minutes
Servings: 4

Ingredients 

  • 1 Onion, Peeled and chopped
  • 150 g Celery, Peeled and chopped
  • 300 g Carrots, Peeled and chopped
  • 500 g Parsnips, Peeled and chopped
  • 3 Leeks, Peeled and chopped
  • 2 Stock cubes
  • 600 ml Water
  • Sea salt and freshly ground black pepper

To finish:

  • 150 ml Single cream
  • 15 g Fresh flat leaf parsley

Instructions 

  • Put the slow cook ingredients into the slow cooker. Cook for 4-6 hours on HIGH or 8-10 hours on LOW.
  • When the vegetables are very soft and tender, remove a couple of ladles full of the vegetables and set aside. Add the parsley and the cream to the remaining soup and blend until very smooth.
  • Add the reserved vegetables back to the soup and serve.

Notes

Season well: Do check for seasoning as this needs plenty of salt and pepper!
For chunky soup: I save some vegetables unblended and add them back in at the end to give the soup some texture, but you could blend everything if you prefer it smooth.
 

Nutrition

Calories: 242kcalCarbohydrates: 44gProtein: 5gFat: 7gSaturated Fat: 4gPolyunsaturated Fat: 0.5gMonounsaturated Fat: 2gCholesterol: 21mgSodium: 605mgPotassium: 1014mgFiber: 11gSugar: 14gVitamin A: 14320IUVitamin C: 42mgCalcium: 154mgIron: 3mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Lunch, Soup
Cuisine: Family Food
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Sarah Rossi founder of TamingTwins.com and author of 'What's for Dinner?' books.

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5 from 56 votes (45 ratings without comment)

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28 Comments

  1. 5 stars
    I’ve made this soup a few times. I use boxed low sodium veg broth instead of the cubes, switched out the parsnips for potatoes and added zucchini. I blend it all up so my kids can’t see what’s in it. Sprinkle with a little grated cheese when I serve in the bowl.

  2. I’ve made this soup 3 times now, love it! So thick and creamy and I get at least 8 regular bowl servings out of it. I puree the whole of it because I don’t want to eat bits of leek. I add 2 tablespoons of salt at the beginning, then adjust at the end