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Slow Cooker French Onion Soup

This slow cooker French onion soup is an easy, hands-free take on a French favorite! With rich, beefy broth and plenty of caramelized onions topped with melty Gruyere cheese.
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Prep Time 10 minutes
Cook Time 12 hours
Total Time 12 hours 10 minutes
Servings: 6
Cuisine: Chinese
Calories: 120
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 6 large sweet onions sliced
  • 4 tablespoon unsalted butter melted
  • 0.25 teaspoon sugar
  • 0.5 teaspoon salt
  • 0.5 teaspoon fresh ground black pepper
  • 4 sprigs fresh thyme
  • 1 bay leaf
  • 6 cup low sodium beef broth
  • 0.5 cup dry white wine
Toppings (Optional)
  • 6 slice french bread
  • 1.5 cup shredded Gruyere cheese

Method
 

Preparation Steps
  1. Caramelize the onions. Place sliced onions in a 6-quart slow cooker. Stir in the melted butter, sugar, salt, and pepper. Top with thyme and bay leaf. Place the lid on the pot and cook on LOW for 8 hours, or until the onions are browned and caramelized. Stir halfway through.
  2. Make it soupy. Once onions are caramelized, stir in the beef broth and wine. Taste for salt and pepper and season accordingly.
  3. Cook. Cover and cook on LOW for 4 hours or on HIGH for 2 hours, until heated through.
  4. Ladle into bowls. Remove the lid and discard the thyme and bay leaf. Ladle the soup into ovenproof bowls and transfer the bowls to a large baking sheet.
  5. Add toppings. Top the soup in the bowls with a slice of French bread and shredded cheese.
  6. Melt the cheese. Turn the oven-broiler to High. Broil the soups in the oven until the cheese is melted, about 2 to 3 minutes.
  7. Serve. Remove from oven and enjoy.

Notes

This recipe is easily adaptable. You can adjust the amount of wine or omit it entirely if preferred.