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By thekitchn.com
How To Make French Onion Soup in the Slow Cooker
Here's a step-by-step recipe for blissfully delicious French onion soup made from start to finish in the slow cooker.
Updated at: Wed, 17 Sep 2025 01:03:59 GMT
Nutrition balance score
Unbalanced
Glycemic Index
34
Low
Glycemic Load
8
Low
Nutrition per serving
Calories196.1 kcal (10%)
Total Fat8.8 g (13%)
Carbs21.5 g (8%)
Sugars10.6 g (12%)
Protein7.9 g (16%)
Sodium1266.5 mg (63%)
Fiber2.9 g (10%)
% Daily Values based on a 2,000 calorie diet
Ingredients
8 servings

3 poundsyellow onions
peeled, sliced, and cut into quarter-moons

2 tablespoonsunsalted butter
melted

2 tablespoonsolive oil

2 teaspoonskosher salt
plus more as needed

freshly ground black pepper

10 cupsreduced-sodium beef broth

2 tablespoonsbalsamic vinegar

3 tablespoonsbrandy
optional

4baguette slices
toasted, per bowl

⅓ cupGruyère cheese
grated, per bowl, 1 1/3 to 2 cups

shallot
Chopped, or fresh onion, optional
Instructions
View on thekitchn.com
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