4.0 from 6 votes
Slow Cooker French Onion Soup
This slow cooker French onion soup is like a cozy hug in a bowl. With caramelized onions, gooey cheese, and a hint of thyme, it's made entirely in the slow cooker! So worth it!
Prep Time
15 mins
Cook Time
15 mins
Additional Time
5 hrs
Total Time
5 hrs 25 mins
Servings: 6 servings
Calories: 388 kcal
Course:
Soup
Cuisine:
French
Ingredients
- 4 yellow onions thinly sliced
- 2 tablespoon butter or olive oil for a vegan option
- 4 cloves garlic minced
- 1 tablespoon sugar
- 1 tablespoon balsamic vinegar
- 2 tablespoon dry sherry optional, but would like to include in the recipe we shoot
- 8 cups vegetable broth low-sodium
- 2 prigs fresh thyme substitute, 1 teaspoon dried thyme
- 2 bay leaves
- ½ teaspoon salt
- ¼ teaspoon black pepper adjust to taste
- 1 tablespoon soy sauce or tamari for gluten-free
- 1 baguette sliced
- 2 cups gruyere cheese freshly shredded
Instructions
- Set your slow cooker to high. Add melted butter (or olive oil), sliced onions, and sugar (if using). Stir to coat the onions evenly. Prop the lid open slightly to allow steam to escape and cook for 6-8 hours on low, stirring occasionally, until onions are golden brown and soft.
- Once onions are caramelized, add minced garlic and cook for another 2-3 minutes on low, stirring occasionally.
- Add balsamic vinegar and sherry to deglaze the slow cooker. Stir well to pick up any browned bits.
- Add vegetable broth, thyme, bay leaves, soy sauce, salt, and pepper. Stir, cover, and cook on low for another 4-6 hours.
- Preheat the oven to 400°F (200°C). Slice the baguette and toast until golden and crispy.
- Remove thyme sprigs and bay leaves from the soup. Ladle the soup into oven-safe bowls, top with toasted baguette slices, and sprinkle with shredded Gruyère.
- Place the bowls under the broiler for a few minutes until the cheese melts and is bubbly.
- Serve with extra thyme or a drizzle of balsamic reduction if desired.
Cup of Yum
Nutrition Information
Calories
388kcal
(19%)
Carbohydrates
35g
(12%)
Protein
18g
(36%)
Fat
19g
(29%)
Saturated Fat
11g
(55%)
Polyunsaturated Fat
1g
Monounsaturated Fat
6g
Trans Fat
0.2g
Cholesterol
58mg
(19%)
Sodium
2221mg
(93%)
Potassium
220mg
(6%)
Fiber
2g
(8%)
Sugar
10g
(20%)
Vitamin A
1221IU
(24%)
Vitamin C
7mg
(8%)
Calcium
514mg
(51%)
Iron
2mg
(11%)
Nutrition Facts
Serving: 6servings
Amount Per Serving
Calories 388
% Daily Value*
| Calories | 388kcal | 19% |
| Carbohydrates | 35g | 12% |
| Protein | 18g | 36% |
| Fat | 19g | 29% |
| Saturated Fat | 11g | 55% |
| Polyunsaturated Fat | 1g | 6% |
| Monounsaturated Fat | 6g | 30% |
| Trans Fat | 0.2g | 10% |
| Cholesterol | 58mg | 19% |
| Sodium | 2221mg | 93% |
| Potassium | 220mg | 5% |
| Fiber | 2g | 8% |
| Sugar | 10g | 20% |
| Vitamin A | 1221IU | 24% |
| Vitamin C | 7mg | 8% |
| Calcium | 514mg | 51% |
| Iron | 2mg | 11% |
* Percent Daily Values are based on a 2,000 calorie diet.