Slow Cooker French Onion Soup


6 - 8 People

Cooking Time

3 to 8 hours

Total Time

3 to 8 hours

  • 1/2 cup unsalted butter, melted

  • 2 tablespoons extra-virgin olive oil

  • 4 pounds yellow onion, peeled and sliced

  • 10 cups beef broth

  • 1 bay leaf

  • Salt and pepper, to taste

  • 1/4 cup all-purpose flour

  • 2 tablespoons balsamic vinegar

  • 1 tablespoon Worcestershire sauce

  • 1 baguette, sliced diagonally and toasted

  • 1 1/2 cups Gruyere or swiss cheese, grated or sliced

  • Minced chives, for garnish

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    1. Add butter, olive oil and onions to a large skillet over medium heat. Cook until onions start to caramelize.
    2. Pour onions into the slow cooker and top with beef broth, bay leaf, salt and pepper.
    3. In a small bowl whisk together flour, balsamic vinegar and Worcestershire sauce until smooth. Stir into soup.
    4. Cover and cook on low for 6 to 8 hours, or on high for 3 to 4 hours.
    5. Scoop soup into oven-safe bowls. Top with 1 slice of toasted bread and cheese. Broil for 5 minutes, or until cheese is melted and bubbly.
    6. Top with chives, serve and enjoy!
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