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Slow Cooker French Onion Soup

Cook Time16 hours
Total Time16 hours
Servings: 6 servings
Author: Taylor Ellingson

Ingredients

  • 3 lbs white onions sliced
  • 8 tablespoons unsalted butter
  • 1 teaspoon salt
  • 8 cups beef broth
  • 1 tablespoon Worcestershire
  • ¼ cup white wine or white cooking wine
  • 1 tablespoon red wine vinegar
  • 4 sprigs thyme plus additional thyme for topping
  • Loaf of Italian bread cut into ¾” slices, for topping
  • 2 cups shredded Gruyere cheese

Instructions

The night before (ideally):

  • Place onions, butter, and salt in large slow cooker.
  • Cook on low for 8-10 hours. This works best if you do it overnight.
  • In the morning, add beef broth, Worcestershire, wine, red wine vinegar, and thyme.
  • Season with salt and pepper, to taste.
  • Cover and cook on low for another 6-8 hours.
  • After 6-8 hours, preheat oven to 350 degrees F. Place oven proof bowls onto baking sheet.
  • Ladle soup into oven proof bowls.
  • Top with 1-2 slices of bread and top each bowl with ~? cup of shredded cheese.
  • Bake in preheated oven for 20 minutes.
  • Turn on broiler and broil until golden brown, keeping a very close eye on it.
  • Garnish with additional thyme leaves.
  • Enjoy!