Slow Cooker French Onion Soup

French onion soup is just one of those soups that really hits the spot. It’s got an incredible amount of cheese, which is so stringy and delicious, then there’s the salty flavor of the broth, and then the bread layered on top. It’s pretty amazing. That being said…this recipe is kind of sneaky. Since it says “Slow Cooker” it appears to be a quick and easy recipe. That is not quite the case. Caramelizing the onions on the stove before adding them to the slow cooker takes about 45 minutes. So, do not make this recipe unless you have time one morning to caramelize onions. I love french onion soup so I definitely thought it was worth the effort!

I found this recipe on

Prep: 45 minutes

Cook: 4-6 on low 6-8 on high


  • 6 tablespoons butter
  • 4 large yellow onions- sliced into rings
  • 1 tablespoon sugar
  • 2 cloves garlic, minced
  • 1/2 cup cooking sherry
  • 7 cups reduced sodium beef broth
  • 1 teaspoon sea salt
  • 1/4 teaspoon dried thyme
  • 1 bay leaf
  • 8 slices of french bread
  • 1/2 cup shredded Gruyere cheese
  • 1/3 cup shredded Swiss cheese
  • 1/4 cup shredded Parmesan cheese
  • 2 tablespoons shredded Mozzarella


Heat butter in a large pot over medium-high heat. Cook and stir onions until translucent, about 10 minutes. sprinkle onions with sugar and reduce heat to medium. Cook and stir onions constantly (I went back and forth between stirring and shredding) until onions are browned, about 30 minutes. Stir in garlic and cook until fragrant, about 1 minute. Add sherry to onion mixture. Pour onion mixture into Slow Cooker and add beef broth, sea salt, thyme, and bay leaf. Cover Slow Cooker and cook on high for 4-6 hours or on low for 8-10 hours (I cooked mine on high for 5 hours).

About 10 minutes before serving, broil french bread. To serve, dish up each bowl and add french bread and each type of cheese.

Serves 4

I hope you enjoy it!


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