When the weather cools down or life feels hectic, nothing beats a warm bowl of homemade soup — especially one that doesn’t require standing over the stove. This Slow Cooker Lentil Soup is a true dump-and-go dinner that’s packed with vegetables, fiber, and flavor. It’s hearty enough for a main dish and perfect for meal prepping or freezing.
It’s one of those easy slow cooker recipes that’s as comforting as it is convenient. Just toss everything in and walk away!
We are sharing tips to help you get the best results when making this recipe. If you don’t need the tips, scroll to the bottom for the full recipe and printable recipe card.
⭐ Why You’ll Love this Recipe ⭐
🥕 Packed with veggies and plant-based protein
⏳ No babysitting the pot — just dump and go
🧊 Freezer-friendly and meal prep approved
💵 Super budget-friendly
🌿 Naturally gluten-free and vegan
🧾 Ingredients
📌 Be sure to see the recipe card below for the full ingredients list with quantities and step-by-step instructions!
- Dried brown or green lentils
- Carrots
- Celery stalks
- Onion
- Garlic cloves
- Diced tomatoes
- Vegetable broth (or chicken broth)
- Dried thyme
- Cumin
- Smoked paprika (optional)
- Black pepper
- Salt
- Lemon juice
🔪 How to Make Lentil Soup in the Slow Cooker
Toss everything into your slow cooker except the spinach (or kale) and lemon juice.
Give it a good stir so everything is mixed together.
Cover and cook on low for 6 to 8 hours or high for 3 to 4 hours, until the lentils are nice and tender.
About 30 minutes before it’s done, stir in the spinach or kale if you’re using it.
Just before serving, pour in the lemon juice and taste to see if it needs more salt or pepper.
⭐ Tips + Variations ⭐
- Want it creamy? Use an immersion blender to puree part of the soup.
- Add chopped sweet potatoes or squash for extra nutrients.
- Spice it up with red pepper flakes or hot sauce.
- Freeze leftovers in airtight containers for up to 3 months.
- Serve with crusty bread, over rice, or with a sprinkle of Parmesan if not vegan.
More Delicious Recipes To Try
Slow Cooker Lentil Soup That Practically Cooks Itself
Ingredients
- 1 ½ cups dried brown or green lentils, rinsed
- 3 carrots peeled and chopped
- 2 celery stalks chopped
- 1 medium onion diced
- 3 garlic cloves minced
- 14.5 oz diced tomatoes canned
- 1 Potato optional
- 6 cups vegetable broth or chicken broth
- 1 tsp dried thyme
- 1 tsp cumin
- ½ tsp smoked paprika optional
- ½ tsp black pepper
- Salt to taste
- 1 tbsp lemon juice added at the end
Directions
- Add all ingredients to the slow cooker, except the lemon juice.
- Stir to combine.
- Cover and cook on LOW for 6–8 hours or HIGH for 3–4 hours, until lentils are tender.
- Right before serving, stir in lemon juice. Taste and adjust salt and pepper if needed.
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