Slow Cooker Onion Soup


This is about the best onion soup I've been able to come up with. Tastes better than any restaurant onion soup I've ever had.

Prep Time:
15 mins
Cook Time:
4 hrs 15 mins
Total Time:
4 hrs 30 mins
3 servings


  • ¼ cup butter, melted

  • 1 large sweet onion (such as Vidalia®), cut into thin slivers

  • 1 small red onion, cut into thin slivers

  • 2 cloves garlic, minced

  • 4 cups beef stock

  • 3 tablespoons brandy

  • 2 teaspoons soy sauce

  • 2 teaspoons Worcestershire sauce

  • salt and ground black pepper to taste

  • 2 cups Italian-style seasoned croutons

  • 3 slices provolone cheese


  1. Melt butter in a skillet over medium heat; cook and stir sweet onion and red onion in melted butter until softened, about 10 minutes. Cook and stir garlic into onion mixture until fragrant, about 2 minutes. Transfer to a slow cooker.

  2. Pour beef stock, brandy, soy sauce, and Worcestershire sauce into slow cooker. Season with salt and black pepper.

  3. Cook soup on High for 4 to 5 hours.

  4. Preheat the oven's broiler and set the oven rack about 6 inches from the heat source.

  5. Ladle the soup into 3 oven-proof bowls; top with croutons and a slice of Provolone per bowl.

  6. Broil in the preheated oven until cheese melts and begins to brown, about 3 minutes.

Nutrition Facts (per serving)

498 Calories
29g Fat
31g Carbs
17g Protein
Nutrition Facts
Servings Per Recipe 3
Calories 498
% Daily Value *
Total Fat 29g 38%
Saturated Fat 16g 82%
Cholesterol 62mg 21%
Sodium 1044mg 45%
Total Carbohydrate 31g 11%
Dietary Fiber 3g 12%
Total Sugars 9g
Protein 17g
Vitamin C 26mg 131%
Calcium 292mg 22%
Iron 2mg 12%
Potassium 448mg 10%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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