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Crock‑Pot French Onion Soup


  • Author: Linda

Description

Slow-cooked caramelized onions and flavorful broth combine in this French onion soup made in a crock‑pot. The long, gentle simmer builds sweetness and depth — finish with crusty bread and melty cheese on top for the ultimate cozy dish.


Ingredients

Scale
  • 6 large yellow onions, thinly sliced

  • 3 tbsp unsalted butter

  • 1 tbsp olive oil

  • 4 cups beef broth (or a mix of beef and chicken)

  • 1 cup dry white wine (optional but adds depth)

  • 1 tsp Worcestershire sauce

  • 2 sprigs fresh thyme (or ½ tsp dried thyme)

  • 2 bay leaves

  • Salt & black pepper, to taste

  • 46 slices baguette or crusty bread

  • 1½ cups grated Gruyère cheese (or Swiss/Emmental)


Instructions

  • Caramelize Onions in the Crock-Pot

    • Add butter, olive oil, and sliced onions into the crock-pot.

    • Stir to coat the onions in butter and oil.

    • Cover and cook on low for 6–8 hours (or on high for 3–4 hours), stirring occasionally, until the onions are deeply golden and sweet.

  • Add Broth & Flavorings

    • Once the onions are caramelized, stir in beef broth, white wine (if using), Worcestershire sauce, thyme, and bay leaves.

    • Season with salt and pepper.

    • Cover and cook on low for another 1–2 hours, letting the flavors meld.

  • Prepare the Bread Topping

    • About 15 minutes before serving, preheat your oven broiler.

    • Place the baguette slices on a baking sheet and toast lightly under the broiler until golden on both sides.

    • Remove and set aside.

  • Finish & Serve

    • Ladle soup into oven-safe bowls or crocks.

    • Place a toasted baguette slice on top of each soup bowl.

    • Sprinkle a generous amount of grated Gruyère cheese over each bread slice.

    • Broil the bowls for 2–4 minutes, or until the cheese is melted, bubbly, and slightly browned.

    • Remove carefully (the bowls will be hot!) and serve immediately.

Notes

  • Slow cooking helps develop sweetness and depth — don’t rush the caramelizing.

  • Stir onions occasionally to prevent burning or sticking.

  • Taste and adjust salt just before serving — flavors concentrate during long cooking.

  • Use oven-safe bowls for finishing under the broiler or remove bread with cheese carefully if not.