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Cozy Crockpot French Onion Soup Recipe with Easy Gruyere Crouton Topping

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A comforting slow-cooked French onion soup made effortlessly in a crockpot, topped with melty Gruyere cheese on toasted bread for a cozy, flavorful meal.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced
  • 3 tablespoons unsalted butter
  • 6 cups beef broth (low-sodium preferred)
  • 1 cup dry white wine
  • 3 garlic cloves, minced
  • 1 teaspoon dried thyme
  • 2 bay leaves
  • Salt and freshly ground black pepper, to taste
  • 6 slices day-old French baguette or crusty bread
  • 2 cups shredded Gruyere cheese (about 200g)

Instructions

  1. Peel and thinly slice 4 large yellow onions, aiming for consistent thickness (about 10 minutes).
  2. Add butter to the slow cooker and set to low heat for about 10 minutes to melt.
  3. Add sliced onions, minced garlic, dried thyme, and bay leaves to the crockpot; stir to coat onions in butter.
  4. Cover and cook on low for 7-8 hours, stirring once or twice if possible.
  5. About 30 minutes before serving, pour in 1 cup dry white wine and 6 cups beef broth; stir, cover, and cook for 30 more minutes.
  6. Preheat the oven broiler. Slice 6 pieces of day-old French bread and toast lightly on a baking sheet.
  7. Top each bread slice generously with shredded Gruyere cheese.
  8. Broil the croutons for 2-3 minutes until cheese bubbles and turns golden brown, watching closely to avoid burning.
  9. Remove bay leaves from the soup. Taste and season with salt and freshly ground black pepper as needed.
  10. Ladle soup into oven-safe bowls, float a Gruyere-topped crouton on each, and optionally broil for 1-2 minutes to melt cheese slightly on top of the soup.
  11. Serve immediately.

Notes

For deeper caramelization, pre-caramelize onions in a skillet for 15 minutes before adding to the crockpot. Watch broiler carefully when melting cheese to avoid burning. Soup freezes well; store soup and croutons separately to prevent sogginess. Vegetarian version: substitute beef broth with vegetable broth and omit wine or replace with extra broth.

Nutrition

Keywords: French onion soup, crockpot soup, slow cooker, Gruyere croutons, comfort food, easy soup recipe, caramelized onions

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