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Crock Pot Slow Cooker French Onion Soup recipe served in a soup crock via flouronmyface.com

Crock Pot French Onion Soup

Arlene Mobley - Flour On My Face

Crock Pot French Onion Soup

I've made French Onion Soup before. One of the hardest parts of making French Onion soup is caramelizing the onions. When you use your crock pot slow cooker to do all the hard work for you the onions are easy to caramelize.
5 from 1 vote
Prep Time 12 mins
Cook Time 12 hrs
Total Time 12 hrs 12 mins
Course Soup
Cuisine French
Servings 4 servings
Calories 362 kcal


  • 6 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 5 cups thinly sliced onion
  • ½ cup cooking wine
  • 3 tablespoons Worcestershire sauce
  • 1 teaspoon ground pepper
  • ½ teaspoon salt
  • 32 ounces beef broth
  • ¼ teaspoon dry thyme
  • Toasted French bread slices
  • Sliced Provolone or Swiss cheese
  • ½ cup finely grated fresh Parmesan cheese
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  • Place the first 7 ingredients into a 6 quart crock pot.
  • Cook on low for 8-9 hours overnight or until the onions are dark and caramelized.
  • Next add the beef broth and thyme to the crock pot.
  • Increase the temperature to high and cook for 2 hours or until simmering.
  • Reduce the heat to low and cook an addition 2 hours.
  • Add a ½ cup Parmesan cheese sprinkled over top of crock pot (or serving bowl-optional)
  • Before serving ladle soup into individual oven safe soup crocks.
  • Place a slice of toasted French bread on top of each crock, place a slice of cheese on top of the bread. Sprinkle the top of the cheese slice with the Parmesan cheese.
  • Melt the cheese under the broiler until golden brown.
  • Serve immediately.


Calories: 362kcal | Carbohydrates: 23g | Protein: 10g | Fat: 24g | Saturated Fat: 14g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 8g | Trans Fat: 1g | Cholesterol: 54mg | Sodium: 1472mg | Potassium: 562mg | Fiber: 4g | Sugar: 10g | Vitamin A: 642IU | Vitamin C: 16mg | Calcium: 233mg | Iron: 2mg
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