Best 8 Slow Cooker French Onion Soup Recipes

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This classic French soup is known for its rich, caramelized onions, savory broth, and melted cheese. Traditionally made with beef broth, onions, herbs, and spices, this hearty soup can be easily made in a slow cooker, allowing for a simple, hands-off approach to creating a flavorful and comforting meal. Gather your ingredients and let your slow cooker do the work, resulting in a warm and inviting dish that's perfect for a cozy dinner or a casual gathering.

Here are our top 8 tried and tested recipes!

SLOW COOKER FRENCH ONION SOUP



Slow Cooker French Onion Soup image

This is a ridiculously easy soup, especially since it cooks in a slow cooker! When it's been simmering all day, you come home to an amazing aroma and a fabulous meal for a cold winter day.

Provided by Chandrav

Categories     Soups, Stews and Chili Recipes     Soup Recipes     Vegetable Soup Recipes     Onion Soup Recipes     French Onion Soup Recipes

Time 5h5m

Yield 8

Number Of Ingredients 14

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

Steps:

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

Nutrition Facts : Calories 249.8 calories, Carbohydrate 17.5 g, Cholesterol 37.6 mg, Fat 14.7 g, Fiber 1.5 g, Protein 11 g, SaturatedFat 8.7 g, Sodium 595.9 mg, Sugar 6 g

SLOW-COOKER FRENCH ONION SOUP



Slow-Cooker French Onion Soup image

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.

Provided by By Betty Crocker Kitchens

Categories     Entree

Time 9h50m

Yield 8

Number Of Ingredients 11

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

Steps:

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

Nutrition Facts : Calories 185, Carbohydrate 21 g, Cholesterol 5 mg, Fat 1, Fiber 2 g, Protein 9 g, SaturatedFat 3 g, ServingSize 1 Serving, Sodium 1240 mg

SLOW-COOKER FRENCH ONION SOUP



Slow-Cooker French Onion Soup image

It's hard to believe something this delightful came from a slow cooker! Topped with a slice of French bread and provolone cheese, individual servings of this French onion soup are sure to be enjoyed by everyone at your dinner table. -Kris Ritter, Pittsburgh, Pennsylvania

Provided by Taste of Home

Categories     Lunch

Time 8h15m

Yield 4 servings.

Number Of Ingredients 7

2 large sweet onions, thinly sliced (about 4 cups)
1/4 cup butter, cubed
2 cans (14-1/2 ounces each) beef broth
2 tablespoons sherry or additional beef broth
1/2 teaspoon pepper
4 slices French bread (1/2 inch thick), toasted
4 slices provolone cheese

Steps:

  • Place onions and butter in a 1-1/2-qt. slow cooker coated with cooking spray. Cover and cook on low for 6 hours or until onions are tender. Stir in the broth, sherry and pepper. Cover and cook 2-3 hours longer or until heated through. , Ladle soup into ovenproof bowls. Top each with a slice of toast and a slice of cheese. Broil 4-6 in. from the heat for 2-3 minutes or until cheese is melted. Serve immediately.

Nutrition Facts : Calories 267 calories, Fat 20g fat (12g saturated fat), Cholesterol 50mg cholesterol, Sodium 1324mg sodium, Carbohydrate 10g carbohydrate (2g sugars, Fiber 1g fiber), Protein 11g protein.

FRENCH ONION SOUP (SLOW COOKER)



French Onion Soup (Slow Cooker) image

My mom's soup that I remember from childhood. Probably as basic as it gets. Add cheese of choice and croutons, if desired.

Provided by Dtison

Categories     Soups, Stews and Chili Recipes     Soup Recipes     Vegetable Soup Recipes     Onion Soup Recipes     French Onion Soup Recipes

Time 4h20m

Yield 6

Number Of Ingredients 5

¼ cup butter
4 large onions, thinly sliced
4 cups beef broth
1 clove garlic, minced
salt and ground black pepper, to taste

Steps:

  • Melt butter in a skillet over medium heat. Cook and stir onions in melted butter until clear and browned, 10 to 15 minutes; transfer to a slow cooker. Add beef broth, garlic, salt, and black pepper to the slow cooker.
  • Cook on High for 4 hours or on Low for 8 hours.

Nutrition Facts : Calories 119.9 calories, Carbohydrate 9.6 g, Cholesterol 20.3 mg, Fat 8.1 g, Fiber 1.7 g, Protein 3.1 g, SaturatedFat 5.1 g, Sodium 584.5 mg, Sugar 4.3 g

SLOW-COOKER BEEFY FRENCH ONION SOUP



Slow-Cooker Beefy French Onion Soup image

Fantastic French onion soup is made even heartier with beef stew meat. Start the soup in the morning and come home to a no-fuss dinner.

Provided by By Betty Crocker Kitchens

Categories     Entree

Time 10h25m

Yield 8

Number Of Ingredients 11

7 small onions, cut in half and thinly sliced (about 7 cups)
1 tablespoon butter or margarine, melted
2 tablespoons sugar
2 dried bay leaves
1 1/2 pounds beef stew meat
3 cans (10 1/2 ounces each) condensed beef consommé
1/4 cup dry sherry or apple juice
1 cup apple juice
1/4 teaspoon dried thyme leaves
8 slices ( 1/2 inch thick) French bread, toasted
2 cups shredded Swiss cheese (8 ounces)

Steps:

  • Toss onions, butter and sugar in 5- to 6-quart slow cooker. Top with bay leaves and beef.
  • Cover and cook on low heat setting 9 to 10 hours or until onions are deep brown.
  • Stir in beef consommé, sherry, apple juice and thyme. Increase heat setting to high. Cover and cook 10 minutes or until hot. Remove bay leaves.
  • To serve, spoon into ovenproof soup bowls and top each serving with slice of toast and 1/4 cup cheese. If desired, broil with tops 6 inches from heat 3 to 5 minutes or until cheese is bubbly and begins to brown.

Nutrition Facts : Calories 440, Carbohydrate 31 g, Cholesterol 80 mg, Fat 1, Fiber 2 g, Protein 34 g, SaturatedFat 10 g, ServingSize 1 Serving, Sodium 910 mg

SLOW-COOKER FRENCH ONION SOUP(COOK'S COUNTRY)



Slow-Cooker French Onion Soup(Cook's Country) image

After quartering, slice the onions pole to pole for substantial slices that will hold up to long cooking. Beef bones are stocked in the freezer or meat section of supermarkets.

Provided by Coppercloud

Categories     Onions

Time 10h20m

Yield 1 pot, 6-8 serving(s)

Number Of Ingredients 14

2 lbs beef bones (see note)
4 tablespoons unsalted butter
6 large yellow onions, quartered and cut into 1/4-inch-thick slices (about 4 pounds)
salt and pepper
1 tablespoon brown sugar
1 teaspoon fresh thyme, minced
5 tablespoons all-purpose flour
3/4 cup apple butter
3/4 cup dry sherry
1/4 cup soy sauce
2 cups low sodium chicken broth
2 cups low sodium beef broth
1 loaf French bread, cut into 1/2-inch slices
2 1/2 cups gruyere cheese, shredded

Steps:

  • COOK ONIONS Arrange beef bones on paper towel-lined plate. Microwave until well browned, 8 to 10 minutes. Meanwhile, set slow cooker to high. Add butter, cover, and cook until melted. Add onions, 2 teaspoons salt, 1 teaspoon pepper, brown sugar, and thyme. Stir flour, apple butter, sherry, and soy sauce together in small bowl until smooth. Pour over onions and toss to coat. Tuck bones under onions around edge of slow cooker. Cover and cook on high heat until onions are softened and deep golden brown, 10 to 12 hours. (Cooked onions can be refrigerated in airtight container for 1 day.).
  • 2. FINISH SOUP Remove bones from slow cooker. Heat chicken and beef broth in microwave until beginning to boil. Stir into slow cooker. Season with salt and pepper.
  • 3. MAKE CROUTONS Adjust oven rack to upper-middle position (about 6 inches from broiler element) and heat oven to 400 degrees. Arrange bread slices in single layer on baking sheet and bake until bread is golden at edges, about 10 minutes. Heat broiler. Divide cheese evenly among croutons and broil until melted and bubbly, 3 to 5 minutes.
  • 4. SERVE SOUP Ladle soup into bowls and top each with 2 croutons. Serve.
  • **Most soup recipes start by chopping or mincing onions. For this recipe, we wanted slices that would retain their shape through 10 to 12 hours of gentle simmering. We found that cutting onions with the grain (rather than across it) yielded slices durable enough for the slow cooker.

SLOW COOKER FRENCH ONION SOUP



Slow Cooker French Onion Soup image

Love that this soup cooks all day in a slow cooker! It does take some prep work, but the taste is well worth it!

Provided by Six Sisters Stuff

Yield 6

Number Of Ingredients 11

3/4 cup butter
4 yellow onions, sliced thinly into rings
1 tablespoon white sugar
2 cloves of garlic, minced
1/2 cup apple cider
7 cups beef broth
1/4 teaspoon thyme
French bread, sliced into 1" slices
1/2 cup provolone cheese
1/2 cup swiss cheese
1/2 cup mozzarella cheese

Steps:

  • In a large skillet on medium-high heat, melt butter. Add in onions and cook until see-through, stirring frequently (It takes about 10 minutes).
  • Add in sugar, and reduce heat to medium. Stir the onions constantly, caramelizing them. It will take about 20-30 minutes.
  • Add in the minced garlic and apple cider, and stir until warmed through.
  • Transfer the onions to the slow cooker and add in beef broth and thyme. Cook on low for 6-8 hours.
  • Before serving, place the french bread slices on a baking sheet and broil in the oven for 1-2 minutes (just until browned).
  • In a small bowl, mix together the three cheeses.
  • Pour soup in oven-safe bowls (the soup will serve 6-8), place a piece of french bread in each bowl, and then top each with a portion of cheese. Place each bowl on the cookie sheet, and broil for 2 more minutes, until the cheese starts to melt and brown.
  • Serve hot.

SLOW COOKER FRENCH ONION SOUP RECIPE - (4/5)



Slow Cooker French Onion Soup Recipe - (4/5) image

Provided by á-55

Number Of Ingredients 11

1/4 c. Unsalted butter
6 Thyme sprigs
1 Bay Leaf
5 lbs. large sweet onions, vertically sliced (about 16 c.)
1 T. Sugar
6 c. Unsalted Beef stock
2 T. Red wine vinegar
1 1/2 t. Kosher salt
1 t. Black pepper
24 (1/2 oz,) slices French baguette bread
5 oz. Gruyere cheese, shredded (about 1 1/4 c.)

Steps:

  • 1. Place butter, thyme, and bay leaf in the bottom of a 6 qt. slow cooker. Add onions; sprinkle with sugar. Cover and cook on HIGH for 8 hours. 2. Remove thyme sprig and bay leaf; discard. Add stock, vinegar, salt (adjust salt if using salted butter and/or stock), and pepper. Cook covered, on HIGH for 30 minutes. 3. Preheat broiler. 4. Arrange bread in a single layer on a baking sheet. Broil 30 seconds on each side or until toasted. Place 1 c. Soup in each of 12 (8 oz.) ramekins or ovenproof bowls. Top each serving with 2 slices of bread and about 2 T. Shredded cheese. Place filled bowls on a jelly roll pan. Broil 2 minutes or until cheese melts and begins to brown. NOTE: I often halve this recipe and it works nicely!

Tips:

  • For a richer flavor, use a combination of beef and chicken broth.
  • If you don't have time to caramelize the onions, you can use a store-bought caramelized onion jam.
  • To make the soup gluten-free, use gluten-free bread or croutons.
  • For a vegetarian version of the soup, omit the beef broth and use vegetable broth instead.
  • Serve the soup with a side of crusty bread or croutons for dipping.

Conclusion:

Slow cooker French onion soup is a classic comfort food that is perfect for a cold winter day. It is easy to make and can be tailored to your own taste preferences. With its rich flavor and hearty ingredients, this soup is sure to become a family favorite.

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