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Bowl of Slow Cooker French Onion Soup topped with melted cheese and herbs

Slow Cooker French Onion Soup Delight

A cozy, hearty soup with savory broth, caramelized onions, and gooey melted cheese, perfect for family gatherings and relaxing evenings.
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Prep Time 15 minutes
Cook Time 8 hours
Total Time 8 hours 15 minutes
Servings: 4 servings
Course: Appetizer, Soup
Cuisine: French
Calories: 350
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 4 large onions, thinly sliced Yellow onions are traditional; mixing with sweet onions can enhance flavor.
  • 4 cups beef broth Can be substituted with vegetable broth for a vegetarian option.
  • 2 tablespoons balsamic vinegar
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon sugar Helps onions to caramelize.
  • 2 cloves garlic, minced
  • 1 teaspoon thyme
  • Salt and pepper to taste
Toppings
  • Gruyère cheese, shredded Use plenty for a cheesy topping!

Method
 

Preparation
  1. Start by slicing the onions into thin rings.
  2. In a pan, heat the butter and olive oil over medium heat. Add the sliced onions and sprinkle with sugar. Cook for about 10-15 minutes until golden brown, stirring occasionally.
Cooking
  1. Pour the caramelized onions into your slow cooker. Add the minced garlic, beef broth, balsamic vinegar, thyme, salt, and pepper. Stir to combine.
  2. Cover and cook on low for 6-8 hours or high for 3-4 hours.
Preparation of Toppings
  1. About 30 minutes before serving, preheat your oven to 350°F (175°C). Arrange sliced baguette on a baking sheet, topping each slice with shredded Gruyère cheese.
  2. Bake the bread in the oven for about 10-15 minutes until the cheese is bubbly and golden.
Serving
  1. Ladle the soup into bowls and top each serving with a slice of cheesy bread. Enjoy!

Notes

Store leftovers in airtight containers in the refrigerator for up to 4 days. Freeze in individual portions without cheese or bread.