What cookware works best?

Use a slow cooker and avoid crowding so the recipe cooks evenly.

How do I know it is done?

Follow the recipe timing, then check the main ingredient for tenderness, bubbling, browning, or safe doneness before serving.

Can I adjust the seasoning?

Yes. Taste near the end and adjust salt, acid, herbs, or heat in small amounts.

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Slow Cooker One-Pot

Slow Cooker French Lentil and Root Vegetable Cassoulet

Name: Slow Cooker French Lentil and Root Vegetable Cassoulet
Prep time: 20 min
Cook time: 360 min
Total time: 380 min
Yield: 6 servings
Cuisine: French-Inspired
Ingredients: 1 cup green or brown lentils, rinsed and drained; 1 large onion, diced; 3 cloves garlic, minced; 2 medium carrots, peeled and chopped; 2 parsnips, peeled and chopped; 1 small rutabaga, peeled and diced; 2 medium potatoes, peeled and diced; 1 celery stalk, diced; 1 cup canned diced tomatoes; 4 cups vegetable broth (low sodium); 2 tablespoons tomato paste; 1 teaspoon dried thyme; 1 teaspoon dried rosemary; 1 teaspoon smoked paprika; 1 bay leaf; Salt and freshly ground black pepper, to taste; 2 tablespoons olive oil; Fresh parsley, chopped (for garnish)

By PanPotPlates Test KitchenReviewed by PanPotPlates Editorial TeamPublished Apr 28, 2026 · Updated May 12, 2026

French-Inspired 380 mins slow cookerone potvegangluten freedairy freefamily dinnerhealthycomfort foodbudget friendlymeal prephearty

Slow Cooker French Lentil and Root Vegetable Cassoulet is a practical PanPotPlates recipe built for dependable weeknight cooking.

Prep 20 min

Cook 360 min

Total 380 min

Servings 6

Difficulty easy

Cuisine French-Inspired

Ingredients

Servings 6

1 cup green or brown lentils, rinsed and drained
1 large onion, diced
3 cloves garlic, minced
2 medium carrots, peeled and chopped
2 parsnips, peeled and chopped
1 small rutabaga, peeled and diced
2 medium potatoes, peeled and diced
1 celery stalk, diced
1 cup canned diced tomatoes
4 cups vegetable broth (low sodium)
2 tablespoons tomato paste
1 teaspoon dried thyme
1 teaspoon dried rosemary
1 teaspoon smoked paprika
1 bay leaf
Salt and freshly ground black pepper, to taste
2 tablespoons olive oil
Fresh parsley, chopped (for garnish)

Ingredients for Slow Cooker French Lentil and Root Vegetable Cassoulet

Instructions

Turn the slow cooker to the sauté or high setting. Add olive oil, then sauté diced onion and minced garlic for 3-4 minutes until softened and fragrant.
Add chopped carrots, parsnips, rutabaga, potatoes, and celery. Stir to combine and cook for another 2 minutes.
Add rinsed lentils, canned diced tomatoes, vegetable broth, tomato paste, dried thyme, rosemary, smoked paprika, bay leaf, salt, and pepper. Stir well to combine all ingredients.
Cover slow cooker and set to low heat. Cook for 5-6 hours, or until lentils and vegetables are tender and the cassoulet has thickened.
Remove bay leaf. Taste and adjust seasoning with additional salt and pepper if needed.
Serve hot, garnished with freshly chopped parsley. This dish pairs well with crusty gluten-free bread or a fresh green salad for a balanced meal.
Store leftovers in an airtight container in the refrigerator for up to 4 days or freeze for up to 3 months.

Slow Cooker French Lentil and Root Vegetable Cassoulet cooking in the recommended pan or pot

Tips

Pan Or Pot Required

This Slow Cooker French Lentil and Root Vegetable Cassoulet is crafted for simple one-pot cooking using a slow cooker .

Cookware Size Guidance

An ideal slow cooker size for this French lentil and root vegetable cassoulet is between 5 to 6 quarts.

Cookware Swap Guidance

h ideal for tender lentils and root vegetables, substitutions are possible: Heavy-Duty Dutch Oven or Oven-Safe Pot: Use on stovetop or in the oven at low temperature (~300°F/150°C), covered tightly, stirring occasionally.

Leftovers Quality

Reheat gently and add a splash of liquid when needed to keep the texture moist and tender.

Frequently Asked Questions

Can I make Slow Cooker French Lentil and Root Vegetable Cassoulet ahead?: Yes. Prep the ingredients or cook the full dish ahead, then reheat gently so the texture stays close to freshly made.
What cookware works best?: Use a slow cooker and avoid crowding so the recipe cooks evenly.
How do I know it is done?: Follow the recipe timing, then check the main ingredient for tenderness, bubbling, browning, or safe doneness before serving.
Can I adjust the seasoning?: Yes. Taste near the end and adjust salt, acid, herbs, or heat in small amounts.

Customize this slow cooker one-pot vegan and gluten-free cassoulet with these ingredient substitutions while maintaining its hearty, budget-friendly, and comforting qualities:

Lentils: Substitute green/brown lentils with red lentils for a softer consistency, or canned lentils for quicker prep, adjusting liquid as needed.
Root Vegetables: Swap rutabaga and parsnips for turnips, sweet potatoes, or butternut squash for variety and seasonal flavor.
Vegetable Broth: Use homemade broth, water plus bouillon cubes, or a gluten-free broth alternative to maintain flavor and dietary needs.
Tomato Paste: Replace with concentrated sun-dried tomato purée or omit for a milder profile.
Herbs and Spices: Fresh herbs like thyme, rosemary, and smoked paprika can be replaced with Italian seasoning or herbes de Provence for a different French-inspired twist.
Oil: Swap olive oil with avocado or coconut oil for a dairy-free, mild-flavored fat.
Additional Protein: Add diced tofu or tempeh for a protein boost and a more substantial one-pot meal.

These substitutions ensure flexibility for your pantry, preferences, and dietary needs without sacrificing the dish’s nourishing, comforting appeal.

Storage and Reheating

Cool Slow Cooker French Lentil and Root Vegetable Cassoulet before storing. Refrigerate leftovers in an airtight container for up to 4 days.

Freeze portions for longer storage when the ingredients are freezer-friendly. Reheat gently with a splash of liquid if the dish looks dry.

Read related air fryer guides and cooking tips.

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Slow Cooker French Lentil and Root Vegetable Cassoulet

Recipe Details

Ingredients

Instructions