Go Back
To make a great Slow Cooker French Onion Soup, you need simple and fresh ingredients. Here’s what you will need: - 4 large yellow onions, thinly sliced - 4 cloves garlic, minced - 1 tablespoon brown sugar - 1 teaspoon dried thyme - 1 teaspoon salt - 1/2 teaspoon freshly ground black pepper - 8 cups low-sodium vegetable broth - 2 tablespoons balsamic vinegar - 1 tablespoon olive oil - 6 slices of crusty French bread - 1 ½ cups shredded Gruyère cheese - Fresh parsley, chopped (for garnish) This list includes all the essentials to create a rich and flavorful soup. I personally love using yellow onions for their sweet flavor when caramelized. The balsamic vinegar adds a nice depth to the taste, making each sip comforting. When selecting your bread, look for crusty French bread. It holds up well in the soup and provides a satisfying crunch. Gruyère cheese melts beautifully and gives that signature cheesy topping we all adore. For a complete guide on how to bring all these ingredients together, check out the Full Recipe. Start by preparing your slow cooker. First, combine four large yellow onions, thinly sliced, and four cloves of minced garlic in the pot. These two ingredients form the soup's base and provide a rich flavor. Next, add one tablespoon of brown sugar, one teaspoon of dried thyme, one teaspoon of salt, and half a teaspoon of freshly ground black pepper. The brown sugar helps caramelize the onions, enhancing their sweetness. Finally, drizzle one tablespoon of olive oil over the mixture. Stir everything well until combined. Now it’s time to slow cook your soup. Cover the slow cooker and set it to low for eight hours. This long cooking time allows the onions to caramelize fully, creating a deep, rich flavor. If you want to check on the progress, avoid opening the lid too often. Instead, you can listen for bubbling sounds or peek during the last hour of cooking. Once the eight hours are up, it’s time to finish the soup. Gently stir in two tablespoons of balsamic vinegar and eight cups of low-sodium vegetable broth. Mixing these ingredients will bring everything together. Cover the slow cooker again and switch to high for the final thirty minutes. This step ensures the broth heats through and flavors meld perfectly. If you want to make it extra special, consider toasting your French bread while the soup finishes cooking. For the full recipe, check out the complete instructions above. Enjoy your delicious slow cooker French onion soup! Choosing the right onions makes all the difference. I prefer yellow onions. They turn sweet when cooked slowly. Sweet onions like Vidalia work too. Avoid red onions as they can be too sharp for this dish. Using low-sodium broth is key. It allows the flavors of the onions to shine. High-sodium broth can mask the rich taste you want. You can always add salt later if needed. Serving in rustic ramekins adds charm to your meal. These bowls hold heat well and look great on the table. You can also use oven-safe bowls if you don't have ramekins. Garnishing is simple but effective. A sprinkle of fresh parsley adds color. A drizzle of balsamic vinegar gives your soup a gourmet touch. It enhances both the look and taste. For the best cheese topping, use Gruyère. It melts beautifully and has great flavor. Place it on top of the bread before broiling. Keep an eye on it to avoid burning. If you can't find Gruyère, try Swiss cheese. It melts well too. Mozzarella is another option, though it lacks the same flavor. Use what you have, and enjoy the soup! {{image_4}} To make this soup gluten-free, you can replace the French bread with gluten-free bread. Look for crusty options that hold up well when toasted. Check labels to ensure the bread is certified gluten-free, so you avoid any hidden gluten. You can also use gluten-free croutons on top for added crunch. If you want a vegetarian twist, simply swap the low-sodium vegetable broth for a rich mushroom stock. This will add a deep, earthy flavor that pairs well with the sweet onions. You can also use a mix of both stocks for a unique taste. To elevate the flavors, consider adding a splash of red wine or sherry. This adds depth and richness to the soup. Start with half a cup and adjust to your taste. Try adding herbs like bay leaf or rosemary to enhance the aroma. Fresh herbs can also brighten the dish. Experiment with these flavors and find your perfect mix. For the full recipe, check the provided link. To store leftover soup, use airtight containers. This keeps the soup fresh and tasty. Let the soup cool down before sealing. Place the containers in the fridge. Your soup will stay good for about 3 to 4 days. You can freeze French onion soup for later. Pour the cooled soup into freezer-safe containers. Leave some space at the top for expansion. Seal tightly and label with the date. When you're ready to eat, thaw the soup in the fridge overnight. Heat it on the stove until it's warm, or use a microwave. For the best taste, use the soup within 3 months if frozen. Proper storage helps to keep the soup fresh. Check for any signs of spoilage before using. If it smells off or looks strange, it's best to toss it. Enjoy your homemade soup knowing you’ve stored it right! For the full recipe, make sure to check back! It takes about 8 hours and 30 minutes in total. Here’s the breakdown: - Prep time: 15 minutes - Cooking time: 8 hours on low, plus 30 minutes on high Yes, you can prepare it in advance. Just slice the onions and garlic the night before. Store them in the fridge. On the day you plan to cook, add them to the slow cooker. This way, you save time and still enjoy great flavors. Crusty bread works best. Here are some options: - French baguette - Ciabatta - Sourdough These breads hold up well in the soup and make a great topping. To add creaminess, consider these ideas: - Stir in heavy cream just before serving. - Use a mix of cheeses, like Gruyère and mozzarella. This will give a rich, velvety texture. Absolutely! To make it vegan, use these adjustments: - Substitute vegetable broth for chicken broth. - Skip the cheese or use a vegan cheese alternative. These changes keep the soup tasty and plant-based. For more details, check the Full Recipe. This blog post showed you how to make slow cooker French onion soup. We covered the key ingredients, like onions, garlic, and Gruyère cheese. I shared step-by-step instructions to guide you through the process. You learned tips for perfecting the soup, including serving ideas and variations. Now you can create a warm, tasty dish for any occasion. Enjoy the rich flavors and comfort of your homemade soup! With these tips and tricks, you’ll impress everyone at the table.

SLOW COOKER FRENCH ONION SOUP

Warm up with this Savory Slow Cooker French Onion Soup recipe that's packed with flavor and comfort. With just a few ingredients like caramelized onions, garlic, and gooey Gruyère cheese, you can create a hearty meal that's perfect for any occasion. Just set your slow cooker and let the magic happen! Click through to explore the full recipe and learn how to make this delicious soup that will impress your family and friends.
Print Recipe Pin Recipe

Ingredients
  

4 large yellow onions, thinly sliced

4 cloves garlic, minced

1 tablespoon brown sugar

1 teaspoon dried thyme

1 teaspoon salt

1/2 teaspoon freshly ground black pepper

8 cups low-sodium vegetable broth

2 tablespoons balsamic vinegar

1 tablespoon olive oil

6 slices of crusty French bread

1 ½ cups shredded Gruyère cheese

Fresh parsley, chopped (for garnish)

Instructions
 

Start by preparing your slow cooker. Add the thinly sliced onions and minced garlic to the pot. Sprinkle in the brown sugar, dried thyme, salt, and freshly ground black pepper. Drizzle the olive oil over the mixture and stir thoroughly until all ingredients are well-combined.

    Cover the slow cooker and set it to the low setting. Allow it to cook for 8 hours, which will give the onions ample time to caramelize and develop their rich flavor.

      Once the 8 hours are complete, gently stir in the balsamic vinegar, followed by the low-sodium vegetable broth. Mix well to ensure the flavors meld together. Then, cover the slow cooker again and turn it to high for an additional 30 minutes to heat everything through.

        While the soup is finishing up, preheat your oven to 400°F (200°C). Arrange the slices of French bread on a baking sheet in a single layer. Toast them in the oven for approximately 5-7 minutes or until they achieve a lovely golden brown color.

          After the soup has completed cooking, ladle it into individual bowls, ensuring each bowl receives a generous portion. Lay a slice of the toasted French bread on top of each bowl. Sprinkle a hearty amount of shredded Gruyère cheese over the bread to ensure a cheesy topping.

            Place the bowls under the oven broiler for about 2-3 minutes, monitoring them closely. This will melt the cheese and create a delightful golden crust on top.

              Once they are bubbly and golden, carefully remove the bowls from the oven. Finish with a sprinkle of fresh chopped parsley for a vibrant touch and serve immediately for a comforting meal.

                Prep Time: 15 minutes | Total Time: 8 hours 30 minutes | Servings: 6

                  - Presentation Tips: For an elegant presentation, serve the soup in rustic ramekins or oven-safe bowls. Add a sprinkle of fresh parsley and perhaps a drizzle of balsamic vinegar on top for an extra gourmet look.