This soup is filled with flavor without all the work.

when prepared using this method.

It’s also substantial enough to act as the main event.

Slow-Cooker French Onion Soup

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Pair with roasted vegetables or a side salad for a hearty dinner.

How Can I Serve French Onion Soup Without Ramekins?

Serve the soup family-style or portioned into bowls, topping with the hot bread right before serving.

raw onions in slow cooker crock overhead

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Can I Make Slow-Cooker French Onion Soup Ahead?

Prepare this soup up to three days in advance.

Cool and refrigerate, then reheat in the slow cooker or on the stovetop until hot throughout.

caramelized onions for french onion soup in slow cooker overhead

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Top with bread and broil as directed before serving.

This soup can also be frozen for up to three months.

Thaw in the refrigerator overnight, then reheat and serve as directed.

french onion soup being made in slow cooker insert overhead

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More Caramelized Onion Recipes You’ll Love

The flavor of caramelized onions is hard to beat.

Place thyme and bay leaf on onion mixture.

Add broth:

Remove and discard thyme and bay leaf.

cheese and bread on top of french onion soup

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Stir in broth and vinegar.

Cover and cook on HIGH until thoroughly heated, about 30 minutes.

Spoon soup into 6 ovenproof ramekins; place on a large rimmed baking sheet.

Slow-Cooker French Onion Soup

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Top each ramekin with 2 baguette slices; divide cheese evenly among ramekins (about 1/4 cup each).

Broil cheese:

Broil until cheese is melted and golden brown, about 3 minutes.

Sprinkle with fresh thyme leaves and black pepper.

Can’t find Gruyere cheese?

Substitute with Emmental, Swiss, Comte, fontina, or any other cheese you love.

French onion soup is a deeply flavored, rich soup.