Slow Cooker French Onion Soup

Slow Cooker French Onion Soup


Slow Cooker French Onion Soup

This slow cooker French onion soup is ridiculously easy to make, mainly since it cooks in a slow cooker! After it’s been simmering all day, you come home to an amazing aroma and a fabulous meal for a cold winter day.

You do not have to caramelize the onions; you can melt the butter in your crockpot, stir in the onions to coat, add the remaining ingredients, and cook. However, caramelizing the onions makes for a much, much better soup!

Slow Cooker French Onion Soup
Slow Cooker French Onion Soup

Summary of French Onion Soup Slow Cooker Recipe

This French Onion Soup Slow Cooker recipe is quick and easy to prepare and with the help of a trusty slow cooker you can whip up this dish with minimal effort.

  • Preparation Time: 30 minutes
  • cook: 4 hrs 45 minutes
  • total: 5 hrs 15 minutes
  • Servings: 8

Ingredients for Slow Cooker French Onion Soup

  • 6 tablespoons butter
  • 4 large yellow onions, sliced and separated into rings
  • 1 tablespoon white sugar
  • 2 cloves garlic, minced
  • ½ cup cooking sherry
  • 7 cups reduced-sodium beef broth
  • 1 teaspoon sea salt, or to taste
  • ¼ teaspoon dried thyme
  • 1 bay leaf
  • 8 slices of French bread
  • ½ cup shredded Gruyere cheese
  • ⅓ cup shredded Emmental cheese
  • ¼ cup freshly shredded Parmesan cheese
  • 2 tablespoons shredded mozzarella cheese
Slow Cooker French Onion Soup
Slow Cooker French Onion Soup

Directions for Slow Cooker French Onion Soup

  1. Heat butter in a large, heavy pot over medium-high heat. Add onions; cook and stir until translucent, about 10 minutes. Sprinkle onions with sugar; reduce heat to medium.
  2. Cook, stirring constantly, until onions are soft and caramelized, at least 30 minutes. Stir in garlic and cook until fragrant, about 1 minute.
  3. Stir sherry into onion mixture; scrape the bottom to dissolve the small bits of browned food. Transfer onions into a slow cooker and pour in beef broth.
  4. Season with sea salt; stir in thyme and bay leaf. Cover and cook on Low for 8 to 10 hours or on High for 4 to 6 hours.
  5. Preheat the oven broiler about 10 minutes before serving. Set an oven rack about 8 inches from the heat source.
  6. Arrange bread slices on a baking sheet; broil until toasted, 1 to 2 minutes per side.
  7. Lightly toss Gruyere, Emmental, Parmesan, and mozzarella cheeses in a bowl. Fill oven-safe soup crocks 3/4 full with onion soup and float a bread slice in each bowl. Top each with about 2 tablespoons cheese mixture.
  8. Place filled bowls onto a baking sheet and broil until cheese topping is lightly browned and bubbling, about 2 minutes.

Cooking Tips

If you like, put all the soup components (soup, toasted bread, and cheese mixture) out on the table and let people make their own soup based on their preferences and taste.

This seems to be the favored method when I host a craft night. People can make their own decisions about what they want in or on their soup!

Nutrition Facts Per Serving

250 calories; protein 11g; carbohydrates 17.5g; fat 14.7g; cholesterol 37.6mg; sodium 595.9mg.

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Slow Cooker French Onion Soup
Article Name
Slow Cooker French Onion Soup
Slow Cooker French Onion Soup
Publisher Name
slow cook recipe
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