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Easy Crockpot French Onion Soup Slow Cooker Recipe

A close-up of crockpot french onion soup slow cooker topped with melted cheese, toasted bread, and thyme.
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Make deep, rich French Onion Soup with minimal effort using your slow cooker. This hands-off method caramelizes the onions perfectly for a comforting, classic meal.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced
  • 4 tablespoons unsalted butter, cut into pieces
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1/4 cup dry sherry or dry white wine (optional)
  • 6 cups good quality beef broth
  • 1 teaspoon Worcestershire sauce
  • 1 bay leaf
  • 1/4 teaspoon dried thyme
  • 4 slices French bread, about 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, stirring halfway through. The onions should be deeply browned and soft.
  3. If using, pour in the sherry or wine and scrape up any browned bits from the bottom of the slow cooker. Let it cook for 15 minutes.
  4. Add the beef broth, Worcestershire sauce, bay leaf, and thyme to the slow cooker. Stir well.
  5. Cook on low for another 1 to 2 hours to let the flavors combine. Remove the bay leaf before serving.
  6. Preheat your oven broiler. Ladle the soup into oven-safe bowls.
  7. Place one slice of bread on top of the soup in each bowl.
  8. Top the bread generously with the 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, bubbly, and golden brown.

Notes

  • For the best flavor, use a high-quality, low-sodium beef broth.
  • If you do not have oven-safe bowls, you can toast the bread separately and melt the cheese on top under the broiler on a baking sheet, then place the cheesy bread on top of the soup just before serving.
  • This recipe is great for making ahead; cool completely, then store in the refrigerator for up to 3 days. Reheat gently on the stovetop before the final broiling step.

Nutrition

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