Photo of Slow Cooker French Onion Soup by WW

Slow Cooker French Onion Soup

Total Time
13 hr 35 min
20 min
13 hr 15 min
Fabulous caramelized onions are a snap to make using a slow cooker – no stirring required.


Uncooked onion(s)

3 pound(s), sliced (about 6 to 7 large onions)

Unsalted butter

2 tbsp(s), melted

Kosher salt

2 tsp(s)

Fino sherry

¼ cup(s)

Minced garlic

2 tsp(s)

Reduced-sodium chicken broth

3 cup(s)

Reduced sodium beef broth

3 cup(s)

Fresh thyme

5 sprig(s), (plus extra for garnish)

Bay leaf

1 leaf/leaves


1 tsp(s)

Low sodium soy sauce

1 tsp(s)

Black pepper

¼ tsp(s), freshly ground

Shredded parmesan cheese

3 tbsp(s)


  1. Combine onions, butter and salt in a slow cooker; cover and cook on high until onions are well-browned, about 8 to 10 hours. Add sherry and garlic; stir to combine. Leave slow cooker set to high and let sit, uncovered, for alcohol to burn off, about 10 to 15 minutes.
  2. Stir in both broths, thyme, bay leaf and sugar; cook, covered, on high, for flavors to blend, about 2 to 3 more hours. Remove thyme and bay leaf; stir in soy sauce and pepper. Sprinkle each serving with cheese and garnish with thyme just before serving.
  3. Yields about 1 1/2 cups soup and 1/2 tablespoon cheese per serving.


Soup may be made up to 3 days before serving. SERVING SIZE (1 1/2 cups soup and 1/2 tablespoon cheese) 168 Cal, 5 g Total Fat, 3 g Sat Fat, 1,180 mg Sod, 25 g Total Carb, 11 g Sugar, 1 g Added Sugar, 4 g Fib, 5 g Prot.