Best Crockpot French Onion Soup Recipe

Crockpot french onion soup is the ultimate cozy classic made easy with the slow cooker. Sweet onions cook low and slow in butter and beef broth, then get topped with toasted bread and melted cheese for a comforting soup recipe that feels restaurant-worthy without the fuss.

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The backstory.

French onion soup always felt like one of those dishes best left to restaurants. Between the caramelized onions and the broiled cheese, it sounded like a lot of work. Making it in the crockpot changed everything. Letting the slow cooker handle the long cook time means rich flavor, less effort, and a soup that fits perfectly into a busy day.

It's a must make.

This crockpot french onion soup deserves a spot in your regular rotation.

• The best soup. Cooking the onions slowly allows them to soften and deepen in flavor, creating a rich onion soup that tastes like it simmered all day.
• Family-friendly. The savory broth, melted cheese, and toasted bread make this a comforting option everyone at the table can enjoy.
• Easy crock recipe. Minimal prep and hands-off cooking make this an easy win for weeknights or slow weekends.

Let's talk flavor and texture.

This slow cooker french onion soup is rich, savory, and deeply comforting. The onions become tender and lightly caramelized as they cook slowly in butter. Beef broth, Worcestershire sauce, and a splash of wine build a layered, savory base without overpowering the french onion flavor. Finished with crusty bread and melted cheese, every bite has warmth, depth, and contrast.

What you'll need.

If you're craving french onion soup in crockpot form, the ingredient list is simple but delivers big results.

• Onions: Thinly sliced sweet onions cook down into soft, flavorful caramelized onions.
• Butter: Unsalted butter helps the onions soften and develop that classic french onion flavor.
• Broth & seasonings: Beef broth, beef soup base, Worcestershire sauce, red wine vinegar, salt, and pepper create a rich, savory soup base.
• Bread & cheese: French bread and Swiss cheese give you that signature melty topping.

For exact ingredient quantities, please see the recipe card below!

How to make French onion soup in crockpot.

Here's an overview on how to make this recipe. See the recipe card below for complete instructions. Enjoy!

1. Add sliced onions and butter to the crockpot or slow cooker.
2. Cook on low for several hours until the onions are very soft and lightly golden.
3. Stir in the beef broth, beef base, wine, Worcestershire sauce, vinegar, and seasonings.
4. Continue cooking until the soup is hot and fully developed.
5. Ladle into oven-safe bowls, top with toasted bread and cheese.
6. Broil briefly until the cheese is melted and bubbly.

Make it your way.

This crockpot french onion soup recipe is easy to customize depending on what you love.

• Add fresh thyme for a classic french onion flavor.
• Use provolone or Gruyère cheese instead of Swiss for a richer topping.
• Skip the wine and use extra broth for a non-alcoholic version.
• Toast the bread on a baking sheet for extra crispness before adding it to the soup.

How to serve it.

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This crockpot french onion soup is comforting on its own but easy to turn into a full meal.

• Serve with a simple green salad for a light dinner.
• Pair with a sandwich for a cozy soup-and-supper combo.
• Enjoy as a starter for a family dinner or holiday meal.
• Add extra cheese on top for an indulgent finish.

Kori's tips.

• Slice onions evenly and thinly so they cook at the same rate.
• Don't rush the slow cook - the long hours are what create flavorful caramelized onions.
• Use unsalted butter so you can better control the seasoning.
• Broil the cheese just until melted to avoid over-browning.

📌 Be sure to save this pin to Pinterest for later!

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