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Slow Cooker Vegan Lentil Soup

  • Author: Jessica Hoffman
  • Prep Time: 10 minutes
  • Cook Time: 4 hours
  • Total Time: 4 hours 10 minutes
  • Yield: 8 servings 1x
  • Category: Main
  • Method: Slow Cook
  • Cuisine: American
  • Diet: Vegetarian


This Weeknight Slow Cooker Lentil Soup is easy to make, hearty, filling and packed with veggies!


Units Scale
  • 1 tbsp avocado oil (or vegetable oil)
  • 1 large onion, chopped
  • 5 garlic cloves, chopped
  • 1 large sweet potato, peeled and cut into cubes
  • 2 medium carrots, chopped
  • 1 celery stalk, chopped
  • 1 cup dried green lentils, rinsed
  • 1 cup dried red lentils, rinsed
  • 8 cups of vegetable broth
  • 1/2 tsp-1 tsp salt
  • 1/2 tsp black pepper
  • 2 bay leaves
  • 5 tsp herbs de Provence or mixed dried herbs
  • 1 cup kale leaves, shredded


  1. Heat the avocado oil in a pan on medium-high heat then add the onion and let cook for 2 minutes. Add the garlic and let cook another 2 minutes, then pour the onions & garlic into the slow cooker.
  2. Add all the rest of the ingredients, except for the kale to the slow cooker. There should be enough liquid to completely cover all the vegetables. (If there’s not, add some more broth)
  3. Cook on low for 8 hours, or high for 4 hours.
  4. 15 minutes before serving, add in the kale & remove the bay leaves.
  5. Taste and adjust any seasoning if necessary.
  6. Serve with freshly chopped parsley if desired.


If you don’t have a slow cooker I recommend this one.

If your soup becomes very thick while cooking, just add in some more broth at the end.

I just a reduced-sodium vegetable broth so I can control how salty the soup turns out.

This weeknight slow cooker lentil soup is already quite hearty and loaded with some veggies, but you can always add some more of your favourites to the mix! Regular potatoes, cauliflower or turnips would work particularly well! 

One thing I always like to do when making recipes in my slow cooker is to brown my onions and garlic in a pan. You can just throw these directly into the slow cooker completely raw, but they won’t get that same delicious caramelized flavour. So this step is always working the extra couple minutes for me!


  • Serving Size: 1/8th recipe
  • Calories: 165
  • Sugar: 3g
  • Fat: 2g
  • Carbohydrates: 30g
  • Fiber: 13g
  • Protein: 11g

Keywords: crockpot lentil soup, lentil soup slow cooker, vegetarian lentil soup, vegan lentil soup