Slow-Cooker Creamy French Onion Chicken Soup with Gruyère Crust
A deeply comforting, slow-cooked twist on classic French onion soup, loaded with tender shredded chicken in a rich caramelized onion and cream broth. Finished with a broiled Gruyère and panko crust that turns golden and bubbly, this hearty dish is weeknight-easy with a seriously impressive result.
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Servings: 4 servings
Calories: 520kcal
Ingredients
Soup
- 3 tablespoons unsalted butter
- 3 large yellow onions thinly sliced
- 1 teaspoon granulated sugar
- 4 cloves garlic minced
- 1 teaspoon fresh thyme leaves plus extra for garnish
- 1/2 cup dry white wine
- 4 cups low-sodium chicken broth
- 1 tablespoon Worcestershire sauce
- 1 tablespoon soy sauce
- 1 1/2 pounds boneless skinless chicken thighs
- 1/2 cup heavy cream
- Salt and black pepper to taste
Gruyère Crust
- 1 1/2 cups shredded Gruyère cheese
- 1/3 cup panko breadcrumbs
- 1 tablespoon unsalted butter melted
Instructions
Instructions
- Melt 3 tablespoons butter in a large skillet over medium heat. Add the sliced onions and sugar and cook, stirring every few minutes, for 12 to 15 minutes until soft and golden. Add the minced garlic and fresh thyme in the last 2 minutes and cook until fragrant.
- Transfer the onion mixture to the slow cooker. Add the white wine to the hot skillet and scrape up any browned bits, then pour into the slow cooker. Add the chicken broth, Worcestershire sauce, and soy sauce and stir to combine.
- Season the chicken thighs generously with salt and black pepper on both sides and nestle them into the slow cooker broth, pressing down so they are mostly submerged. Cover and cook on LOW for 6 hours.
- Use two forks to shred the cooked chicken directly in the slow cooker. Stir in the heavy cream, replace the lid, and cook on HIGH for 15 to 20 minutes until the cream is fully incorporated. Taste and adjust seasoning with salt and pepper as needed.
- Preheat the broiler to high. Transfer the soup to individual oven-safe ramekins or a large shallow oven-safe baking dish. Mix the panko breadcrumbs with the melted butter. Scatter the shredded Gruyère evenly over the surface, then top with the buttered panko. Broil on the top rack, 4 to 5 inches from the heat, for 3 to 5 minutes until the cheese is fully melted, bubbling, and deeply golden brown. Garnish with fresh thyme leaves and serve immediately.
Notes
For the deepest flavor, do not skip the stovetop onion sauté step before slow cooking. Always add the heavy cream in the last 15 to 20 minutes of cooking to prevent curdling. Watch the broiler closely during the final step — the cheese can go from perfectly golden to burnt very quickly. Gruyère can be substituted with Swiss cheese or provolone. For a richer broth, substitute beef broth for the chicken broth.
Nutrition
Calories: 520kcal | Carbohydrates: 22g | Protein: 38g | Fat: 28g | Sodium: 780mg | Fiber: 2g | Sugar: 9g