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Crockpot French onion soup in a spoon.

Crockpot French Onion Soup

Katerina | Diethood
This crockpot French onion soup is an easy take on a French favorite with the same buttery goodness. Add bread and cheese for a fancy meal!
Servings : 6 servings
Prep Time 10 mins
Cook Time 11 hrs 40 mins
Total Time 12 hrs


  • 6 sweet onions,
  • 4 tablespoons unsalted butter, melted
  • 1/4 teaspoon sugar
  • 1/2 teaspoon salt
  • 1/2 teaspoon fresh ground pepper
  • 4 to 6 sprigs fresh thyme
  • 1 bay leaf
  • 6 cups low sodium beef broth
  • 1/2 cup dry white wine
  • salt and pepper, to taste
  • 6 slices french bread optional
  • 1 1/2 cups shredded gruyere cheese, optional


  • Place sliced onions in a 6 quart slow cooker.
  • Stir in melted butter, sugar, salt, and pepper.
  • Top with thyme and bay leaf, COVER and cook on LOW for about 8 hours, or until onions are browned and caramelized. Stir half way through. 
  • Once onions are caramelized, stir in the beef broth and wine.
  • Taste for salt and pepper and season accordingly.
  • Cover and cook on LOW for 4 hours, or on HIGH for 2 hours, or until heated through.
  • Remove and discard thyme and bay leaf.
  • Turn the oven-broiler on High.
  • Ladle soup into ovenproof bowls.
  • Top the bowls with a slice of french bread and cheese.
  • Broil in oven until cheese is melted, about 2 to 3 minutes.
  • Serve.


WW Freestyle SmartPoints without bread and cheese: 4
WW Freestyle SmartPoints with bread and cheese: 12
If watching your calorie/carb intake, omit the bread and cheese.
You can also make a quicker version of this soup by starting it off on the stove top:
  1. Combine onions, butter, sugar, salt, and pepper in a large skillet, and cook the onions for about 25 minutes, or until browned and caramelized.
  2. Transfer the onions to the slow cooker, add in beef broth, wine, thyme, salt, and pepper, and cook for 6 hours on LOW.
  3. When soup is ready, ladle it into ovenproof bowls, place a slice of baguette in each bowl, top with shredded cheese, and broil for couple minutes, or until cheese is melted.


Calories: 468 kcal | Carbohydrates: 62 g | Protein: 18 g | Fat: 15 g | Saturated Fat: 8 g | Cholesterol: 42 mg | Sodium: 360 mg | Potassium: 971 mg | Fiber: 4 g | Sugar: 18 g | Vitamin A: 425 IU | Vitamin C: 15.9 mg | Calcium: 240 mg | Iron: 3.4 mg | Net Carbs: 58 g

Nutritional info is an estimate and provided as courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.

Course: Soup
Cuisine: French
Keyword: crockpot french onion soup, french onion soup, french onion soup recipe, how to make french onion soup, slow cooker french onion soup