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The Ultimate Easy Crockpot French Onion Soup with Gruyère Croutons

Close-up of a bowl of easy crockpot french onion soup topped with a cheesy crouton.
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Make rich, deeply flavored French Onion Soup with minimal effort using your slow cooker. This set it and forget it recipe delivers classic comfort food.

Ingredients

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  • 3 lbs yellow onions, thinly sliced
  • 4 tablespoons unsalted butter, cut into pieces
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 2 cloves garlic, minced
  • 1/2 cup dry sherry or dry white wine (optional)
  • 8 cups high-quality beef broth
  • 1 tablespoon Worcestershire sauce
  • 1 teaspoon fresh thyme leaves
  • 1 baguette, sliced 1 inch thick
  • 8 ounces Gruyère cheese, shredded

Instructions

  1. Place the sliced onions, butter, salt, and pepper into your slow cooker.
  2. Cook on LOW for 8 to 10 hours, or on HIGH for 4 to 5 hours, until the onions are very soft and deeply caramelized. Stir halfway through the cooking time.
  3. Stir in the minced garlic and cook for 10 more minutes on HIGH.
  4. If using, pour in the sherry or wine and scrape up any browned bits from the bottom of the slow cooker. Cook for 15 minutes on HIGH until the liquid reduces slightly.
  5. Add the beef broth, Worcestershire sauce, and thyme to the slow cooker. Stir well.
  6. Cover and cook on LOW for 1 more hour to let the flavors combine.
  7. Preheat your oven broiler. Arrange the baguette slices on a baking sheet.
  8. Ladle the soup into oven-safe bowls. Top each bowl with one or two bread slices.
  9. Cover the bread completely with shredded Gruyère cheese.
  10. Place the bowls on a baking sheet and broil for 2 to 4 minutes, watching closely, until the cheese is melted, bubbly, and golden brown. Serve immediately.

Notes

  • For the deepest flavor, use a good quality, low-sodium beef broth.
  • If you do not have oven-safe bowls, toast the bread separately until crisp, then place it on top of the soup just before serving and top with cheese, melting the cheese under the broiler on a separate tray before topping the soup.
  • This recipe works well for overnight cooking on the LOW setting if you prefer a hands-off approach, but check the onions around the 8-hour mark.

Nutrition

Find it online: https://kingscook.com/easy-crockpot-french-onion-soup/