Slow Cooker Vegan Leek and Potato Soup


A hearty crockpot vegan potato soup made without animal products but still full of rich flavor. Sautéing the vegetables before simmering in the slow cooker brings out the flavor of seemingly simple ingredients.

Prep Time:
20 mins
Cook Time:
3 hrs 40 mins
Total Time:
4 hrs


  • ¼ cup vegan butter

  • 3 tablespoons olive oil

  • 2 large leeks, diced

  • 1 yellow onion, minced

  • 1 large carrot, diced

  • 1 cup minced Pleurotus mushrooms (oyster mushrooms)

  • 2 pounds potatoes, peeled and diced

  • 4 cups low-sodium vegetable broth

  • 1 cup unsweetened oat milk, divided

  • 1 tablespoon potato starch

  • salt and ground black pepper to taste


  1. Turn on the Sauté function on your slow cooker. Heat vegan butter and olive oil in the slow cooker. Add leeks, onion, carrot, and mushrooms. Cook and stir until leeks and onions are translucent and softened, carrots have softened, and mushrooms have liquefied, about 7 minutes. Add potatoes and vegetable broth; mix well. Mix 1 tablespoon oat milk with potato starch in a small bowl to create a slurry and stir it into soup.

  2. Place remaining oat milk in a microwave-safe bowl and heat in the microwave until hot, about 30 seconds. Pour into soup and season with salt and pepper. Turn off the Sauté function.

  3. Cook on Low for 6 hours or High for 3 1/2 hours. Stir soup before serving.


If your slow cooker does not have a Sauté function, sauté the ingredients in a skillet, then transfer the ingredients to the slow cooker to proceed. Do not skip the sauté method. It is vital in creating robust and rich flavor.

If you don't want to use oat milk, use any unsweetened, neutral-flavored, full-bodied vegan milk. Rice milk is not a good substitute. Flax milk is a good substitute.

Nutrition Facts (per serving)

251 Calories
11g Fat
36g Carbs
4g Protein
Nutrition Facts
Servings Per Recipe 8
Calories 251
% Daily Value *
Total Fat 11g 14%
Saturated Fat 2g 12%
Sodium 200mg 9%
Total Carbohydrate 36g 13%
Dietary Fiber 4g 15%
Total Sugars 5g
Protein 4g
Vitamin C 30mg 148%
Calcium 47mg 4%
Iron 2mg 11%
Potassium 655mg 14%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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