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5 from 1 vote

slow cooker french onion soup

Prep Time30 minutes
Cook Time10 hours
Total Time10 hours 30 minutes
Servings: 5
Author: Valentina | The Baking Fairy

Ingredients

  • 1 ½ lbs sweet yellow onions sliced thinly
  • 6 tablespoon butter
  • 4 tablespoon olive oil
  • 3 tablespoon flour
  • 3 tablespoon water
  • ½ cup white wine
  • 2 teaspoon sugar
  • 1 teaspoon salt
  • ½ teaspoon pepper
  • ½ teaspoon thyme
  • 4 cups beef broth use veggie broth for a vegetarian version!
  • 5 thick slices French bread
  • 5 slices provolone cheese
  • 1 cup shredded mozzarella cheese
  • ½ cup freshly grated Parmesan cheese

Instructions

  • In your crockpot set on high, combine butter, oil, onions, sugar, salt, pepper, and thyme.
  • In a small cup, whisk together the flour and water until smooth, and pour into the slow cooker.
  • Finally, add in the wine, cover, and let the onions cook for about 3-4 hrs on high (8-10 hrs on low), until onions are very soft and golden brown.
  • When almost ready to serve, add in the beef or veggie broth, and allow soup to cook for at least 1 more hour.
  • When ready to serve, pour the soup into 5 oven-safe bowls or ramekins. Top each bowl with a slice of bread, and put one slice of provolone on top of each. Sprinkle the mozzarella and parmesan on top.
  • Place bowls under the broiler (around 450-500F) for 2-3 minutes, watching VERY carefully, until cheese is melted and bubbly. Serve immediately!