Slow Cooker Onion Soup
Warm your soul with the comforting flavors of this Slow Cooker Onion Soup, a delightful twist on the classic French onion soup. Perfectly caramelized yellow onions form the heart of this dish, enriched with a savory blend of beef stock, dry white wine, and aromatic herbs like thyme and bay leaf. Let the slow cooker do the work, infusing the soup with deep, rich flavors over hours of gentle simmering. The pièce de résistance? A golden, toasted baguette slice crowned with a luscious blanket of melted Gruyère and Parmesan cheese, broiled to bubbly perfection. With minimal prep time and the ease of slow cooking, this recipe is a must-try for cozy nights, elegant gatherings, or anytime you crave a timeless classic with a gourmet flair.
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Recipe Information
Ingredients
- 4 tablespoons unsalted butter
- 6 medium yellow onions
- 1 teaspoon sugar
- 1 teaspoon salt
- 1 tablespoon all-purpose flour
- 6 cups beef stock
- 0.5 cup dry white wine
- 1 leaf bay leaf
- 1 teaspoon fresh thyme
- 1 loaf baguette
- 2 cups Gruyère cheese
- 0.5 cup Parmesan cheese
Instructions
Peel and thinly slice the yellow onions into half-moons.
In a large skillet, melt the unsalted butter over medium heat. Add the sliced onions, sugar, and salt.
Cook the onions, stirring occasionally, until they become soft and caramelized, about 20-25 minutes.
Sprinkle the caramelized onions with flour and cook for 1-2 minutes, stirring constantly.
Transfer the onions to the slow cooker.
Add the beef stock, dry white wine, bay leaf, and thyme to the slow cooker. Stir to combine.
Cover the slow cooker and cook on low for 6-8 hours or on high for 3-4 hours.
Before serving, slice the baguette into 1-inch thick rounds and toast them under the broiler until golden brown.
Ladle the soup into oven-safe bowls and top each bowl with a toasted baguette slice.
Sprinkle Gruyère and Parmesan cheese over the baguette slices.
Place the bowls under the broiler for 2-3 minutes, or until the cheese is melted and bubbling.
Serve the soup hot, garnished with extra thyme if desired.
Nutrition Facts
Calories |
3083 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 159.3 g | 204% | |
| Saturated Fat | 90.4 g | 452% | |
| Polyunsaturated Fat | 4.7 g | ||
| Cholesterol | 459 mg | 153% | |
| Sodium | 11912 mg | 518% | |
| Total Carbohydrate | 247.3 g | 90% | |
| Dietary Fiber | 19.0 g | 68% | |
| Total Sugars | 49.4 g | ||
| Protein | 154.5 g | 309% | |
| Vitamin D | 1.6 mcg | 8% | |
| Calcium | 3531 mg | 272% | |
| Iron | 17.5 mg | 97% | |
| Potassium | 2446 mg | 52% | |
*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
