Slow Cooker French Onion Soup : Rich, Caramelized, and Comforting
This Slow Cooker French Onion Soup delivers deep, savory flavor with minimal effort. Caramelized onions slowly simmer with beef broth, herbs, and a splash of wine, creating a rich base that’s finished off with crusty bread and gooey melted cheese. Whether you’re feeding a crowd or prepping cozy weeknight dinners, this set-it-and-forget-it version of the French classic never misses.
- Prep Time: 15 minutes
- Cook Time: 6–8 hours (low)
- Total Time: 8 hours
Ingredients
4 large yellow onions, thinly sliced
3 tablespoons butter
1 tablespoon olive oil
1 teaspoon sugar
1 teaspoon salt
½ teaspoon black pepper
2 teaspoons Worcestershire sauce
1 teaspoon dried thyme (or a few sprigs of fresh)
6 cups beef broth (low sodium preferred)
½ cup dry white wine (optional)
1 bay leaf
For Serving:
1 baguette, sliced and toasted
2 cups shredded Gruyère or Swiss cheese
Instructions
In a skillet (optional step for deeper flavor), sauté onions with butter, oil, sugar, and salt over medium heat for 10–15 minutes until golden.
Transfer onions to slow cooker. Add broth, wine, Worcestershire sauce, thyme, bay leaf, and pepper. Stir to combine.
Cook on low for 6–8 hours or high for 3–4 hours. Discard bay leaf before serving.
To serve: Ladle soup into oven-safe bowls, top with toasted baguette slices and shredded cheese.
Broil for 2–3 minutes until cheese is melted and bubbly.
Nutrition
- Calories: 320
- Fat: 16g
- Carbohydrates: 30g
- Protein: 12g