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Easy Crockpot French Onion Soup

Close-up of a bowl of crockpot french onion soup slow cooker topped with melted, bubbly Gruyère cheese over a crouton.
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Make rich, savory French Onion Soup with minimal effort using your slow cooker. This recipe focuses on deeply caramelized onions for authentic flavor.

Ingredients

Scale
  • 5 large 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 rich beef broth
  • 2 sprigs fresh thyme
  • 1 bay leaf
  • 1 tablespoon Worcestershire sauce
  • 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 browned. Stir halfway through the cooking time.
  3. Add the minced garlic and cook for 15 minutes more.
  4. If using, pour in the sherry or wine. Scrape up any browned bits from the bottom of the slow cooker. Cook on high for 15 minutes to allow the alcohol to evaporate.
  5. Stir in the beef broth, thyme sprigs, bay leaf, and Worcestershire sauce.
  6. Cook on low for an additional 1 to 2 hours to let the flavors combine. Remove and discard the thyme sprigs and bay leaf before serving.
  7. Preheat your oven broiler. Ladle the soup into oven-safe bowls.
  8. Top each bowl with a slice of baguette. Sprinkle generously with shredded Gruyère cheese.
  9. Place the bowls on a baking sheet and broil for 2 to 4 minutes, watching closely, until the cheese is melted and bubbly brown.

Notes

  • For the best flavor, use high-quality, rich beef broth. This is key for a savory soup.
  • If you do not have oven-safe bowls, you can toast the bread separately and melt the cheese under the broiler on a separate tray, then place the cheesy toast on top of the soup just before serving.
  • This slow cooker french onion soup recipe is great for making ahead; cool completely, then refrigerate for up to 3 days. Reheat gently on the stovetop before the final broiling step.

Nutrition

Find it online: https://cheffinity.com/crockpot-french-onion-soup-slow-cooker/