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Crockpot French Onion Soup Recipe

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★★★★★

4.5 from 87 reviews

This Crockpot French Onion Soup recipe offers a rich and comforting classic French dish made easy with slow cooking. Sweet caramelized onions simmered in beef broth with thyme create a deep flavorful base, topped with toasted French bread and melted Gruyère cheese for an indulgent finish.

Ingredients

Scale

Soup Ingredients

  • 4 large onions, thinly sliced
  • 6 cups beef broth
  • 2 tbsp butter
  • 1 tsp sugar
  • 1 tsp dried thyme
  • Salt and pepper, to taste

Toppings

  • French bread, sliced and toasted
  • 2 cups Gruyère cheese, shredded

Instructions

  1. Caramelize the Onions: Add the thinly sliced onions, butter, and sugar to the Crockpot. Cook on high for 4 hours, stirring occasionally until the onions become deeply caramelized and golden brown, developing rich sweetness and flavor.
  2. Add Broth and Seasonings: Pour in the beef broth, then add dried thyme, salt, and pepper. Reduce heat to low and cook for an additional 4-5 hours to allow the flavors to meld together for a hearty soup base.
  3. Prepare Bowls and Toast Bread: While the soup is finishing, slice French bread and toast it until crisp, ready for topping the soup before serving.
  4. Assemble and Broil: Ladle the hot soup into ovenproof bowls, place a slice or two of toasted French bread on top, then generously sprinkle shredded Gruyère cheese over the bread. Place the bowls under a preheated broiler for 2-3 minutes, until the cheese is melted, bubbly, and slightly browned.

Notes

  • Stir the onions occasionally during the caramelization step to prevent burning and ensure even cooking.
  • For a vegetarian version, substitute beef broth with vegetable broth and use a vegetarian cheese alternative.
  • Use oven mitts when broiling the cheese-topped bowls, as they will be very hot.
  • Leftover soup can be refrigerated for up to 3 days and reheated gently on the stovetop.

Keywords: Crockpot French Onion Soup, slow cooker soup, caramelized onion soup, classic French soup, Gruyère cheese soup

Find it online: https://tastemadebyclara.com/crockpot-french-onion-soup-recipe/