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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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Our easy Slow-Cooker French Onion Soup is a fantastic winter meal made with little cleanup. How do you make Slow-Cooker French Onion Soup? Start by lining your slow-cooker and cooking the onions. Then add the flour, Worcestershire sauce, sugar, pepper and broth. Cover and cook for a no-fuss soup that's rich in flavor. Follow the directions to prepare Cheesy Broiled French Bread to get every last spoonful. If you've got 15 minutes to prep, this French onion soup recipe in the slow cooker will turn your table into the place to be by the end of the day.
Updated Dec 22, 2020
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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
  • 4 cans (14 1/2 ounces each) ready-to-serve beef broth

Cheesy Broiled French Bread

  • 8 slices French bread, 1 inch thick
  • 3/4 cup shredded mozzarella cheese (3 ounces)
  • 2 tablespoons grated or shredded Parmesan cheese
Make With
Progresso Broth


  • 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
    In lined slow cooker, mix onions and margarine.
  • 3
    Cover and cook on high heat setting 30 to 35 minutes or until onions begin to slightly brown around edges.
  • 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
    Prepare Cheesy Broiled French Bread. Place 1 slice bread on top of each bowl of soup. Serve immediately.

Tips from the Betty Crocker Kitchens

  • 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
    Here's some "broth math" to help you if don't have any ready-to-serve beef broth on hand. You can use three 10 1/2-ounce cans of condensed beef broth with 2 1/2 soup cans of water or 7 cups of your homemade beef broth. Or add 7 cups of water with 7 beef bouillon cubes or 2 heaping tablespoons of beef bouillon granules.
  • tip 3
    Vegetarians in your family? Use 4 cans of ready-to-serve vegetable broth instead of the beef broth. The color will not be a rich, deep brown, though, so Golden French Onion Soup may be a more appropriate name!
  • tip 4
    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.


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

Nutrition Facts

Serving Size: 1 Serving
Calories from Fat
Total Fat
Saturated Fat
Total Carbohydrate
Dietary Fiber
% Daily Value*:
1 Starch; 2 Vegetable; 1 Fat;
*Percent Daily Values are based on a 2,000 calorie diet.
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