Description

This Vegetarian Lentil Soup in the crockpot is a hearty, hands-off meal that fills your kitchen with cozy aromas all day long. Tender lentils, classic veggies, warm spices, and a bright hint of lemon come together in a nourishing bowl that’s perfect for chilly nights. It’s budget-friendly, high in fiber and protein, and naturally meatless comfort food you can feel good about.

Ingredients

Scale

1 cup dried lentils (green or brown), rinsed
1 medium onion, chopped
2 carrots, diced
2 celery stalks, diced
3 cloves garlic, minced
1 can (14.5 oz) diced tomatoes, with juice
6 cups vegetable broth
1 teaspoon ground cumin
1 teaspoon dried thyme
1 bay leaf
Salt and pepper, to taste
2 cups kale or spinach, chopped (optional)
1 tablespoon lemon juice (optional)

Instructions

Rinse the lentils under cold water, picking out any debris or damaged lentils. Drain well.
Add the lentils, chopped onion, diced carrots, diced celery, minced garlic, diced tomatoes with their juice, vegetable broth, ground cumin, dried thyme, bay leaf, salt, and pepper to the crockpot.
Stir everything together until the ingredients are evenly combined.
Cover and cook on LOW for 6–8 hours or on HIGH for 3–4 hours, until the lentils and vegetables are very tender.
If using kale or spinach, stir it into the soup during the last 30 minutes of cooking, allowing it to wilt and soften.
Once the lentils are tender, remove and discard the bay leaf. Stir in the lemon juice, if using, for a bright, fresh finish.
Taste and adjust seasoning with additional salt and pepper as needed. Ladle into bowls and serve warm.

Notes

Green or brown lentils work best here because they hold their shape well during long, slow cooking.
For a thicker, creamier texture, lightly mash some of the lentils in the crockpot with a spoon or potato masher before serving.
The salt level will depend heavily on your vegetable broth; start with less and adjust at the end if needed.
If your slow cooker runs hot, start checking the lentils a bit earlier to avoid overcooking them into complete mush (unless you like it very thick).
This soup thickens as it cools; when reheating, add a splash of broth or water to loosen it back to your desired consistency.

Prep Time: 15 minutes
Cook Time: 6–8 hours (LOW) or 3–4 hours (HIGH)
Category: Soup, Main Course
Method: Slow Cooker / Crockpot
Cuisine: American, Mediterranean-inspired

Nutrition

Serving Size: 1/6 of recipe (about 1 1/2 cups)
Calories: 180 kcal (approx.)
Sugar: 5 g (approx.)
Sodium: 620 mg (approx., varies by broth)
Fat: 3 g (approx.)
Saturated Fat: 0.5 g (approx.)
Unsaturated Fat: 2.5 g (approx.)
Trans Fat: 0 g
Carbohydrates: 30 g (approx.)
Fiber: 11 g (approx.)
Protein: 10 g (approx.)
Cholesterol: 0 mg

Keywords: vegetarian lentil soup, crockpot lentil soup, slow cooker lentil stew, healthy lentil recipe, vegan soup, cozy winter soup