Slow Cooker French Onion Soup

Slow Cooker French Onion Soup

Serves: 6 - 8 People
Cooking Time: 3 to 8 hours
Slow Cooker French Onion Soup


  • 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


Print This Recipe
This will be your new favorite soup recipe. Hands. Down.
  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!