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+ servings

Slow Cooker Onion Soup

This onion soup is the best I've ever made, surpassing the flavor of any restaurant onion soup I've tried.
Prep Time 15 minutes
Cook Time 4 hours 15 minutes
Total Time 4 hours 30 minutes
Course Soup
Cuisine world cuisine
Servings 3
Calories 498 kcal

Ingredients
  

  • 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

Instructions
 

  • 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.
  • Pour beef stock, brandy, soy sauce, and Worcestershire sauce into slow cooker. Season with salt and black pepper.
  • Cook soup on High for 4 to 5 hours.
  • Preheat the oven's broiler and set the oven rack about 6 inches from the heat source.
  • Ladle the soup into 3 oven-proof bowls: top with croutons and a slice of Provolone per bowl.
  • Broil in the preheated oven until cheese melts and begins to brown, about 3 minutes.

Nutrition

Calories: 498kcalCarbohydrates: 31gProtein: 17gFat: 29gSaturated Fat: 16gCholesterol: 62mgSodium: 1044mgPotassium: 448mgFiber: 3gSugar: 9gVitamin C: 26mgCalcium: 292mgIron: 2mg
Keyword Slow Cooker Onion Soup
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