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Slow-Cooker French Onion Soup

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  • Prep 15 min
  • Total 9 hr 50 min
  • Servings 8
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This fantastic French onion soup makes a hearty meal. Start the soup in the morning and come home to a no-fuss dinner.
Created May 14, 2018
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  • Reynolds™ Slow Cooker Liners

  • 3 cups sliced onions (3 medium)
  • 3 tablespoons margarine or butter, melted
  • 3 tablespoons all-purpose flour
  • 1 tablespoon Worcestershire sauce
  • 1 teaspoon sugar
  • 1/4 teaspoon pepper
  • 7 ½ cups ready-to-serve beef broth

  • 8 slices French bread, 1 inch thick
  • 3/4 cup shredded mozzarella cheese
  • 2 tablespoons grated or shredded Parmesan cheese


  • 1
    1. Place Reynolds™ Slow Cooker Liners inside a 5- to 6 1/2 -qt slow cooker bowl. Make sure that liner fits snugly against the bottom and sides of bowl and pull the top of the liner over rim of bowl.
  • 2
    2. In lined slow cooker, mix onions and margarine.
  • 3
    3. Cover and cook on high heat setting 30 to 35 minutes or until onions begin to slightly brown around edges.
  • 4
    4. Mix flour, Worcestershire sauce, sugar and pepper. Stir flour mixture and broth into onions. Cover and cook on low heat setting 7 to 9 hours (or high heat setting 3 to 4 hours) or until onions are very tender.
  • 5
    5. Prepare Cheesy Broiled French Bread. Place 1 slice bread on top of each bowl of soup. Serve immediately.
  • 6
    Method for Cheesy Broiled French Bread: Set oven control to broil. Place bread slices on rack in broiler pan. Sprinkle with cheese. Broil with tops 5 to 6 inches from heat about 3 minutes or until cheese is melted.

Expert Tips

  • Tip 1
    Serve food directly from the lined slow cooker. Once your slow cooker cools, remove the liner and throw away for easy clean up.
  • Tip 2
    Ingredient Substitution Vegetarians in your family? Use vegetable broth instead of the beef broth. The colour will not be a rich, deep brown, though, so Golden French Onion Soup may be a more appropriate name!

Nutrition Information

185 Calories, 8g Total Fat, 9g Protein, 21g Total Carbs

Nutrition Facts

Serving Size: 8
Total Fat
Saturated Fat
Total Carbs
Dietary Fiber
% Daily Value*:
*Percent Daily Values are based on a 2,000 calorie diet.
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