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This image shows a bowl of Crockpot French Onion Soup topped with a slice of toasted bread and melted cheese, enhancing the caramelized onions and cheese flavor.

Crockpot French Onion Soup Recipe

Crockpot French Onion Soup is a rich, comforting classic made with caramelized onions slow-cooked in savory beef broth, herbs, and a touch of wine. Topped with crusty bread and melted cheese, this easy slow-cooker recipe delivers restaurant-worthy flavor with minimal effort.
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Prep Time 20 minutes
Cook Time 6 hours
Total Time 6 hours 20 minutes
Course Soup
Cuisine American
Servings 8 people
Calories 367 kcal

Equipment

  • 6- QT Crockpot
  • Ladle
  • Measuring spoons
  • Measuring spoons
  • Cutting board
  • Whisk

Ingredients
  

  • 3 large white onions sliced
  • ½ cup shredded Emmental cheese
  • 6 tbsp shredded Parmesan cheese
  • 8 slices French bread
  • ¾ cup shredded Gruyere cheese
  • 3 tbsp butter
  • 64 oz vegetable broth
  • 2 tbsp brown sugar
  • 1 tbsp Worcestershire sauce
  • 1 tsp dried thyme
  • 1 clove garlic minced
  • ⅓ cup dry sherry
  • 1 bay Leaf

Instructions
 

  • Melt butter in a large non-stick pan over medium-low heat and slowly cook the onions with brown sugar until they are soft, golden, and caramelized, about 20 minutes.
    This image shows a top-down shot of onions being cooked in a pan, caramelizing to bring out their sweet, rich flavor for French Onion Soup.
  • Transfer the caramelized onions to a slow cooker and add the rest of the ingredients, keeping the bread and cheese aside.
    This image shows a top-down shot of the caramelized onions being transferred into the slow cooker, preparing for the next stage of the soup.
  • Cover and cook on low for 6-8 hours.
    This image shows a top-down shot of the slow cooker, where the French Onion Soup is simmering, blending the flavors of the caramelized onions and broth.
  • Remove the bay leaf, then pour the soup into serving bowls.
    This image shows a top-down shot of French Onion Soup being served into bowls, ready for the final garnishing.
  • Place slices of dry bread on top and sprinkle generously with cheese.
    This image shows a top-down shot of a slice of bread being placed on top of the French Onion Soup, followed by melted cheese for added richness and flavor.
  • Broil for 2-3 minutes until the cheese melts and turns golden brown.
    This image shows a top-down shot of the French Onion Soup under the broiler, allowing the cheese to melt and create a golden, bubbly topping.
  • Serve immediately and savor the rich, comforting flavors!

Notes

  • Use a mix of Gruyère and Parmesan cheese for an authentic flavor.
  • For a thicker soup, add a slurry of cornstarch and water during the last 30 minutes of cooking.