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Slow Cooker French Onion Soup

This French Onion Soup is deliciously exquisite and bursting with heavenly caramelized notes of comforting satisfaction.
Cook Time13 hours
Total Time13 hours
Course: Appetizer, Side Dish, Soup
Cuisine: American, French
Keyword: best french onion soup recipe, best slow cooker french onion soup, crock pot french onion soup, easy slow cooker french onion soup, quick and easy french onion soup, slow cooker french onion soup, slow cooker soup recipe
Servings: 8
Calories:

Equipment

Ingredients

  • 3 lbs sweet onions sliced
  • ¼ cup melted unsalted butter
  • 1 tbsp brown sugar
  • 6 cups unsalted or low-sodium beef broth/stock
  • 2 tbsp dry sherry vinegar
  • 1 tsp dried thyme
  • ½ tsp salt
  • ½ tsp black pepper
  • 3 garlic cloves minced
  • 1 bay leaf
  • French Bread
  • 1 cup freshly shredded gruyere cheese

Instructions

  • Place sliced onions in the slow cooker. Add brown sugar and melted butter. Mix well and cover. Cook on high for 10 hours.
  • Remove lid and add garlic, thyme, dry sherry and mix. Add beef broth and bay leaf.
  • Cover and cook on high for 2-3 hours. Discard bay leaf. Season with salt & pepper to taste.

Toast bread ~ This is highly recommended but not required. It will be slightly crunchy and not soggy. 

  • Preheat the oven to 325°F (162°C). Place the sliced bread on a baking sheet and toast 2 minutes per-side or until golden. Remove the bread from the oven.
  • Transfer the soup to a bowl(s). Place toast o top. Sprinkle gruyere cheese on top of the bread and soup.
  • Return the baking sheet to the oven. Broil on high for 3-4 minutes or until the Gruyere is bubbly and golden brown. Then remove from the oven. Exercise caution: the dish/bowl will be very hot.
  • It is highly recommended to pre-toast the bread prior to placing on the soup bowl as it will maintain a better crunch. However if you prefer your bread a bit soggy then you can just place sliced bread and cheese on top of the soup. 
    Broil until the cheese has melted. Again exercise caution: the dish will be very hot.

Serve immediately and enjoy!

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