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
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6 large yellow onions, thinly sliced
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3 tbsp unsalted butter
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1 tbsp olive oil
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4 cups beef broth (or a mix of beef and chicken)
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1 cup dry white wine (optional but adds depth)
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1 tsp Worcestershire sauce
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2 sprigs fresh thyme (or ½ tsp dried thyme)
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2 bay leaves
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Salt & black pepper, to taste
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4–6 slices baguette or crusty bread
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1½ cups grated Gruyère cheese (or Swiss/Emmental)
Instructions
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Caramelize Onions in the Crock-Pot
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Add butter, olive oil, and sliced onions into the crock-pot.
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Stir to coat the onions in butter and oil.
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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.
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Add Broth & Flavorings
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Once the onions are caramelized, stir in beef broth, white wine (if using), Worcestershire sauce, thyme, and bay leaves.
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Season with salt and pepper.
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Cover and cook on low for another 1–2 hours, letting the flavors meld.
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Prepare the Bread Topping
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About 15 minutes before serving, preheat your oven broiler.
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Place the baguette slices on a baking sheet and toast lightly under the broiler until golden on both sides.
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Remove and set aside.
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Finish & Serve
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Ladle soup into oven-safe bowls or crocks.
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Place a toasted baguette slice on top of each soup bowl.
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Sprinkle a generous amount of grated Gruyère cheese over each bread slice.
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Broil the bowls for 2–4 minutes, or until the cheese is melted, bubbly, and slightly browned.
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Remove carefully (the bowls will be hot!) and serve immediately.
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Notes
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Slow cooking helps develop sweetness and depth — don’t rush the caramelizing.
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Stir onions occasionally to prevent burning or sticking.
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Taste and adjust salt just before serving — flavors concentrate during long cooking.
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Use oven-safe bowls for finishing under the broiler or remove bread with cheese carefully if not.