Go Back
+ servings
5 from 4 votes
Spooning out French Onion Soup.

Slow Cooker French Onion Soup

17 17 17
WW Freestyle: 12
Prep Time10 mins
Cook Time11 hrs 40 mins
Total Time12 hrs
This classic, hearty, DELICIOUS French Onion Soup is prepared in the crock pot, and it's loaded with incredible flavor, caramelized onions, and CHEESE!
Course: Soup
Cuisine: French
Servings: 6 serves
Calories: 468


  • 6 sweet onions, thinly sliced (you can also use yellow onions, but up the sugar to 1 teaspoon)
  • 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 fat free, 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 (if you can't find gruyere, use swiss cheese)


  • 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.
  • Please see my notes for a lighter version of this soup, as well as a quicker cooking version. 


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.
Nutrition Facts
Slow Cooker French Onion Soup
Amount Per Serving
Calories 468 Calories from Fat 135
% Daily Value*
Fat 15g23%
Saturated Fat 8g40%
Cholesterol 42mg14%
Sodium 360mg15%
Potassium 971mg28%
Carbohydrates 62g21%
Fiber 4g16%
Sugar 18g20%
Protein 18g36%
Vitamin A 425IU9%
Vitamin C 15.9mg19%
Calcium 240mg24%
Iron 3.4mg19%
* Percent Daily Values are based on a 2000 calorie diet.
Keywords: crockpot french onion soup, french onion soup, french onion soup recipe, how to make french onion soup, slow cooker french onion soup