french onion soup slow cooker recipe

Written ByJenny Smyth Posted on
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The Best french onion soup slow cooker recipe

French onion soup is a classic dish that originated in France, and its rich flavor profile has made it a staple in many cuisines around the world. The slow cooker recipe I’m sharing today is a game-changer, as it allows you to cook the soup to perfection without having to constantly monitor the stovetop.

The result is a rich, velvety broth that’s infused with the deep flavor of caramelized onions. I love how this recipe is easy to customize to suit my family’s tastes – whether we’re in the mood for a comforting, low-key dinner or a more elaborate meal for company, this soup always hits the spot.

As a bonus, it’s packed with nutrients and can be easily adapted to suit various dietary needs. I’ve been making this recipe for years, and my kids (and husband!)

always request it when they’re feeling under the weather or just need a pick-me-up. It’s become a staple in our household, and I’m confident it’ll become one in yours too!

The best part? It’s incredibly easy to make and requires minimal prep time – just toss all your ingredients into the slow cooker and let it do its magic.

You can’t go wrong with this tried-and-true recipe.

Slow Cooker French Onion Soup

4.5 from 1725 votes

This slow cooker French onion soup delivers deep, rich flavor with minimal effort. Caramelized onions simmer in a savory beef broth with herbs, then are topped with crusty bread and melted Gruyere cheese.

Prep Time20 mins
Cook Time8 hours 10 mins
Resting Time0 mins
Total Time8 hours 30 mins
Servings: 6Cuisine: InternationalCalories: 380 kcal

🥘Ingredients

For the Soup

4 large yellow onions, thinly sliced
3 tablespoons unsalted butter, melted
2 tablespoons olive oil
1 teaspoon salt
1/2 teaspoon black pepper
1 teaspoon dried thyme
2 bay leaves
6 cups beef broth, low sodium
1/2 cup dry white wine or sherry
1 tablespoon Worcestershire sauce

For Serving

1 French baguette, sliced into 1-inch thick rounds
2 cups shredded Gruyere cheese

👨‍🍳Directions

1In a large skillet over medium heat, melt the butter with olive oil.
2Add the sliced onions and cook, stirring occasionally, for 10 minutes until they soften and begin to turn golden.
3This initial browning jumpstarts the caramelization process.
4Transfer the softened onions to the slow cooker.
5Add the salt, pepper, thyme, bay leaves, beef broth, white wine, and Worcestershire sauce.
6Stir to combine all ingredients evenly.
7Cover the slow cooker and cook on low heat for 8 hours, or on high for 4 hours, until the onions are very tender and the broth is deeply flavored.
8The soup should be aromatic and the onions nearly translucent.
9About 10 minutes before serving, preheat your oven’s broiler to high.
10Arrange the baguette slices on a baking sheet and toast them under the broiler for 1 to 2 minutes per side until golden brown.
11Watch closely to prevent burning.
12Ladle the hot soup into oven-safe bowls, filling them about three-quarters full.
13Place one or two toasted baguette slices on top of each bowl, then generously sprinkle shredded Gruyere cheese over the bread.
14Place the bowls on a baking sheet and broil for 2 to 4 minutes, until the cheese is melted, bubbly, and lightly browned in spots.
15Remove carefully and let cool for 2 minutes before serving.

🔧Equipment

6-quart slow cooker
Large skillet
Cutting board
Chef’s knife
Baking sheet
Oven-safe soup bowls or ramekins

📊Nutrition Facts (per serving)

🔥Calories: 380 kcal🧈Total Fat: 18g💛Saturated Fat: 10g❤️Cholesterol: 50mg🧂Sodium: 920mg🌾Total Carbs: 30g🥦Dietary Fiber: 3g🍬Sugars: 8g🥩Protein: 20g

📝Notes

For a richer flavor, use a mix of beef and chicken broth. You can also add a splash of brandy or cognac along with the wine. The soup base can be refrigerated for up to 3 days or frozen for 3 months; add the bread and cheese just before serving.

Watch Video Of How Slow Cooker French Onion Soup Works

This French onion soup slow cooker recipe has been a lifesaver on busy weeknights when I need something hearty and comforting for my family. It’s also perfect for special occasions or when we’re entertaining guests – everyone loves it!

One of my favorite aspects of this recipe is how easy it is to store leftovers – simply refrigerate or freeze for later use. When reheating, be sure to add some crusty bread or croutons on top for an extra-special treat.

❓ Frequently Asked Questions About Slow Cooker French Onion Soup

Q: What type of onions should I use for this recipe?

I recommend using yellow onions for their sweet and mild flavor, but you can also experiment with other varieties like shallots or leeks if you prefer.

Q: Can I make this recipe in advance?

Yes, you can prepare the soup up to 24 hours in advance and store it in the fridge until ready to serve.

Q: How do I prevent the onions from burning during cooking?

To avoid burning, make sure to stir the onions occasionally as they cook and don’t leave them unattended.

Q: Can I substitute beef broth with chicken or vegetable broth?

You can use any type of broth you prefer, but keep in mind that beef broth will give you a more authentic French onion soup flavor.

Q: How do I reheat leftover French onion soup?

Simply reheat the soup on the stovetop over low heat or in the microwave until warmed through.

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