clock clock iconcutlery cutlery iconflag flag iconfolder folder iconinstagram instagram iconpinterest pinterest iconfacebook facebook iconprint print iconsquares squares iconheart heart iconheart solid heart solid icon
A ramekin full of French onion soup, topped with bread slices and melted Gruyere cheese.

French Onion Soup

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 5 from 6 reviews
  • Author: Shelly
  • Prep Time: 10 minutes
  • Cook Time: 6 hours
  • Total Time: 6 hours 10 minutes
  • Yield: 8 servings 1x
  • Category: Dinner, Appetizer, Side
  • Method: Slow Cooker
  • Cuisine: French


The best recipe for cozy, classic French Onion Soup made easily in a slow cooker. A flavorful broth and caramelized onions, topped with bread and melted Gruyere cheese. Perfect for keeping warm this winter!


  • 3 large yellow onions, thinly sliced
  • 1/4 cup butter, cubed
  • 2 teaspoons kosher salt
  • 1 teaspoon fresh ground black pepper
  • 8 cups beef broth or vegetable broth
  • 1/2 cup red wine
  • 1 bay leaf
  • 1 teaspoon dried thyme
  • 2 beef bouillon cubes
  • 2 teaspoons Worcestershire sauce
  • 16 slices French Baguette, sliced 1/4- inch thick
  • 8 ounces Gruyere cheese, grated
  • 1/4 cup grated Parmesan cheese


  1. Place onions, butter, salt, and pepper in your slow cooker. Cook on high for 3-4 hours until the onions are tender.
  2. Stir onions, and add in broth, wine, bay leaf, thyme, bouillon, and Worcestershire.
  3. Continue cooking on high heat for 2-3 more hours until onions are cooked down.
  4. When ready to serve, remove the bay leaf from the soup, and ladle the soup into oven-safe bowls, or ramekins.
  5. Turn oven to broil, and top each bowl with 2 slices of bread, and cheese. Place bowls on a baking sheet and place under the broiler for 2-3 minutes or until cheese is melted.


Stove Top Instructions: In a large Dutch Oven over medium heat, melt the butter and saute the onions for 10-12 minutes, or until they are golden and soft. Season with salt and pepper. Add in the broth, wine, bay leaf, thyme, bouillon, and Worcestershire. Stir to combine. Bring to a boil and reduce heat to a simmer. Cook for 1 hour uncovered, stirring occasionally. Follow steps 4 & 5 in recipe to serve.


  • Serving Size: 1 bowl
  • Calories: 399
  • Sugar: 5.5 g
  • Sodium: 1598.7 mg
  • Fat: 17.5 g
  • Carbohydrates: 44.6 g
  • Protein: 16.4 g
  • Cholesterol: 49 mg
Scroll to Top