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Crock Pot French Onion Soup

A warm and comforting Crock Pot French Onion Soup featuring caramelized onions, aromatic herbs, and melted Gruyère cheese.
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Prep Time 10 minutes
Cook Time 8 hours
Total Time 8 hours 10 minutes
Servings: 6 servings
Course: Appetizer, Soup
Cuisine: French
Calories: 290
Ingredients Method Notes

Ingredients
  

Main ingredients
  • 4 large large onions, thinly sliced Use yellow onions or a mix of sweet Vidalia or red onions.
  • 4 tablespoons unsalted butter For caramelizing the onions.
  • 1 teaspoon sugar To enhance caramelization of the onions.
  • 4 cups beef broth (or vegetable broth for a lighter version) Choose robust vegetable broth for a vegetarian version.
  • 1 cup dry white wine Can be omitted for a non-alcohol version.
  • 1 teaspoon thyme Dried or fresh thyme can be used.
  • to taste Salt and pepper For seasoning.
  • 1 baguette slices for serving Toast until golden brown for topping.
  • 2 cups shredded Gruyère cheese Also can use mozzarella or provolone.

Method
 

Preparation
  1. Melt the butter in a skillet over medium heat. Add the thinly sliced onions and sprinkle with sugar. Cook, stirring often, for about 15-20 minutes until golden brown.
  2. Transfer the caramelized onions into the crock pot. Pour in the beef broth, white wine, and thyme. Season with salt and pepper to taste. Stir to combine all ingredients.
Cooking
  1. Cover the crock pot and set it on low for 6-8 hours, or on high for 3-4 hours.
Serving Preparation
  1. About 30 minutes before serving, preheat your oven to broil. Place baguette slices on a baking sheet and toast until golden brown.
  2. Once the soup is ready, ladle it into oven-safe bowls. Top generously with the toasted baguette and a handful of shredded Gruyère cheese. Broil for 2-3 minutes until the cheese is bubbling and golden brown.

Notes

Store leftovers in an airtight container in the refrigerator for 3-4 days, or freeze the soup without the cheese and bread for up to 2-3 months. Reheat as desired.