Here is an appetizing introduction to the recipe, ranging from 350-500 characters, written before any headings. French onion soup is a classic dish that warms the heart and soul. With the convenience of a crockpot, you can create a rich and savory broth filled with caramelized onions and topped with melty cheese. This recipe is perfect for busy weeknights or gatherings with friends. Let your slow cooker do the work while you enjoy the delicious aroma filling your kitchen.
Ingredients
- 4 large onions, thinly sliced
- 4 cups beef broth
- 1 cup white wine (optional)
- 2 tablespoons butter
- 1 tablespoon olive oil
- 2 teaspoons thyme
- Salt and pepper to taste
- 1 baguette, sliced
- 2 cups shredded Gruyère cheese
- Fresh parsley for garnish
Servings and Cooking Time
This recipe serves 4 people. Preparation time is about 15 minutes, and cooking time is approximately 6-8 hours on low heat.
Nutritional Value
Each serving (1 bowl) contains approximately 300 calories, 10g protein, 15g fat, 30g carbohydrates, and 2g fiber. This nutritional information is based on a single serving.
Step-by-Step Cooking Process
- Heat butter and olive oil in a skillet over medium heat.
- Add sliced onions and cook until caramelized, about 15 minutes.
- Transfer caramelized onions to the crockpot.
- Pour in the beef broth and white wine.
- Add thyme, salt, and pepper to taste.
- Stir the mixture well to combine.
- Cover and cook on low for 6-8 hours.
- During the last 30 minutes, preheat the oven to broil.
- Toast baguette slices until golden brown.
- Serve soup in bowls, topping with toasted baguette and shredded cheese; broil until cheese melts.
Alternative Ingredients
You can substitute beef broth with vegetable broth for a vegetarian version. Additionally, any melty cheese, like mozzarella or cheddar, can replace Gruyère. Feel free to experiment with different herbs, such as rosemary or basil, for a unique flavor twist.
Serving and Pairings
Crockpot French onion soup pairs wonderfully with a fresh green salad or a side of crusty bread. You can also serve it as an appetizer before a hearty main dish like beef stew or roasted chicken.
Storage and Reheating
Store any leftover soup in an airtight container in the fridge for up to 3 days. When reheating, add a splash of broth to maintain its creamy texture. This soup can be frozen for up to 3 months; just be sure to leave out the bread and cheese until serving.
Cooking Mistakes
- Using high heat instead of low can burn the onions.
- Not caramelizing onions long enough results in a lack of flavor.
- Forgetting to season the broth can make the soup bland.
- Overloading the crockpot may lead to uneven cooking.
- Using stale bread instead of fresh can affect texture.
Helpful Tips
- Slice onions evenly for consistent cooking.
- Consider adding a splash of sherry for extra depth.
- For a richer flavor, use homemade beef broth.
- Top with fresh herbs for a burst of freshness.
- Experiment with different cheeses to suit your taste.
FAQs
Can I make French onion soup in advance?
Yes, you can prepare the soup in advance and store it in the fridge. Just reheat before serving and add fresh toppings.
What type of cheese is best for topping?
Gruyère is traditional, but you can use Swiss, mozzarella, or a blend for a different flavor profile.
Can I make this soup vegetarian?
Absolutely! Substitute beef broth with vegetable broth and skip the cheese or use a plant-based alternative.
How do I thicken the soup?
If you prefer a thicker soup, mix a tablespoon of cornstarch with cold water and stir it in during the last hour of cooking.
Is it okay to freeze French onion soup?
Yes, you can freeze it without the bread and cheese. Just store in an airtight container and reheat when ready to serve.
Conclusion
Crockpot French onion soup is the perfect dish for busy days or cozy nights. With its rich flavors and comforting warmth, it’s a dish that brings people together. Enjoy this delightful recipe with friends and family, and savor every spoonful!

Crockpot French Onion Soup
Ingredients
- 4 large onions thinly sliced
- 4 cups beef broth
- 1 cup white wine optional
- 2 tablespoons butter
- 1 tablespoon olive oil
- 2 teaspoons thyme
- Salt and pepper to taste
- 1 baguette sliced
- 2 cups shredded Gruyère cheese
- Fresh parsley for garnish
Instructions
- Heat butter and olive oil in a skillet over medium heat.
- Add sliced onions and cook until caramelized, about 15 minutes.
- Transfer caramelized onions to the crockpot.
- Pour in the beef broth and white wine.
- Add thyme, salt, and pepper to taste.
- Stir the mixture well to combine.
- Cover and cook on low for 6-8 hours.
- During the last 30 minutes, preheat the oven to broil.
- Toast baguette slices until golden brown.
- Serve soup in bowls, topping with toasted baguette and shredded cheese; broil until cheese melts.