Slow Cooker French Onion Soup

Recipe for Slow Cooker French Onion Soup
Becky Luigart-Stayner


1/2 cup (1 stick) butter or margarine
3 large onions, thinly sliced
4 cups hot water
2 tablespoons instant beef bouillon or 6 beef bouillon cubes
1 teaspoon Worcestershire sauce
1/2 teaspoon salt
4 slices toasted French bread
1/2 cup freshly grated Parmesan or Gruyere cheese


Melt butter in a skillet over low heat. Add onions and cook slowly, up to 45 minutes to release maximum flavor, or until nicely browned, stirring frequently. Transfer to a slow cooker. Add water, bouillon, Worcestershire sauce, and salt. Cover and cook on low for 4 to 6 hours.

To serve, top each bowl with 1 slice of bread. Sprinkle each with 2 tablespoons Parmesan. Recipe may be doubled and kept hot in slow cooker.


Makes 4 servings.


Reader Comments

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French Onion Soup

We use some Brewer's Yeast, and yes a good splash of Old Vine Zinfandel with the onions to deepen and enhance flavor. Home made Beef stock is the best and yes make sure it's Gruyere. Go BIG flavor, or go home. . .

French onion soup

If it doesn’t have wine it’s not French onion soup thank you

Crockpot French Onion Soup

I used BOXED beef broth (consume) rather than the bouillon (which makes it rather too salty in my opinion) and think it would be even better with homemade beef broth. Plus it has to be Gruyere cheese - it's the right flavor and melting point. It's a nice idea, making it in the crock pot, the recipe just needs a little tweaking. jh

French onion soup

Absolutely Gruyere cheese. Sure it's more expensive, but it's worth it. It puts "French" in French onion soup.